129731900 has 36 divisors (see below), whose sum is σ = 290606400. Its totient is φ = 50217600.

The previous prime is 129731887. The next prime is 129731923. The reversal of 129731900 is 9137921.

It is a happy number.

It is a super-2 number, since 2×129731900² = 33660731755220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17825 + ... + 24024.

It is an arithmetic number, because the mean of its divisors is an integer number (8072400).

Almost surely, 2^129731900 is an apocalyptic number.

129731900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129731900 is an abundant number, since it is smaller than the sum of its proper divisors (160874500).

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

129731900 is a wasteful number, since it uses less digits than its factorization.

129731900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41894 (or 41887 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 129731900 is about 11389.9912203654. The cubic root of 129731900 is about 506.2312211700.

The spelling of 129731900 in words is "one hundred twenty-nine million, seven hundred thirty-one thousand, nine hundred".