129397638 has 32 divisors (see below), whose sum is σ = 274256640. Its totient is φ = 40586400.

The previous prime is 129397613. The next prime is 129397651. The reversal of 129397638 is 836793921.

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, 13456 + ... + 20972.

It is an arithmetic number, because the mean of its divisors is an integer number (8570520).

Almost surely, 2^129397638 is an apocalyptic number.

129397638 is an abundant number, since it is smaller than the sum of its proper divisors (144859002).

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

129397638 is a wasteful number, since it uses less digits than its factorization.

129397638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692.

The product of its digits is 489888, while the sum is 48.

The square root of 129397638 is about 11375.3082595594. The cubic root of 129397638 is about 505.7960688836.

The spelling of 129397638 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, six hundred thirty-eight".