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131205404 = 22113783971
BaseRepresentation
bin1111101001000…
…00100100011100
3100010212220222102
413310200210130
5232042033104
621004104232
73152141021
oct764404434
9303786872
10131205404
1168075620
1237b35078
132124b345
14135d5548
15b7baa1e
hex7d2091c

131205404 has 48 divisors (see below), whose sum is σ = 260620416. Its totient is φ = 57268800.

The previous prime is 131205391. The next prime is 131205419. The reversal of 131205404 is 404502131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134639 + ... + 135609.

It is an arithmetic number, because the mean of its divisors is an integer number (5429592).

Almost surely, 2131205404 is an apocalyptic number.

It is an amenable number.

131205404 is a deficient number, since it is larger than the sum of its proper divisors (129415012).

131205404 is a wasteful number, since it uses less digits than its factorization.

131205404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 131205404 is about 11454.4927430245. The cubic root of 131205404 is about 508.1406135228.

Adding to 131205404 its reverse (404502131), we get a palindrome (535707535).

The spelling of 131205404 in words is "one hundred thirty-one million, two hundred five thousand, four hundred four".

Divisors: 1 2 4 11 22 37 44 74 83 148 166 332 407 814 913 971 1628 1826 1942 3071 3652 3884 6142 10681 12284 21362 33781 35927 42724 67562 71854 80593 135124 143708 161186 322372 395197 790394 886523 1580788 1773046 2981941 3546092 5963882 11927764 32801351 65602702 131205404