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129800450 = 25213215361
BaseRepresentation
bin1111011110010…
…01100100000010
3100001020112202002
413233021210002
5231212103300
620514024002
73134166653
oct757114402
9301215662
10129800450
11672a5aaa
1237578002
1320b78a00
141334b52a
15b5de5d5
hex7bc9902

129800450 has 36 divisors (see below), whose sum is σ = 261445878. Its totient is φ = 47923200.

The previous prime is 129800443. The next prime is 129800459. The reversal of 129800450 is 54008921.

It is a Cunningham number, because it is equal to 113932+1.

It can be written as a sum of positive squares in 9 ways, for example, as 1 + 129800449 = 1^2 + 11393^2 .

It is not an unprimeable number, because it can be changed into a prime (129800459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 770 + ... + 16130.

Almost surely, 2129800450 is an apocalyptic number.

129800450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129800450 is an abundant number, since it is smaller than the sum of its proper divisors (131645428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129800450 is a wasteful number, since it uses less digits than its factorization.

129800450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15399 (or 15381 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 129800450 is about 11393.0000438866. Note that the first 4 decimals coincide. The cubic root of 129800450 is about 506.3203692254.

The spelling of 129800450 in words is "one hundred twenty-nine million, eight hundred thousand, four hundred fifty".

Divisors: 1 2 5 10 13 25 26 50 65 130 169 325 338 650 845 1690 4225 8450 15361 30722 76805 153610 199693 384025 399386 768050 998465 1996930 2596009 4992325 5192018 9984650 12980045 25960090 64900225 129800450