129538408 has 16 divisors (see below), whose sum is σ = 243273060. Its totient is φ = 64665600.

The previous prime is 129538391. The next prime is 129538457. The reversal of 129538408 is 804835921.

It can be written as a sum of positive squares in 2 ways, for example, as 129458884 + 79524 = 11378^2 + 282^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7503 + ... + 17758.

Almost surely, 2^129538408 is an apocalyptic number.

It is an amenable number.

129538408 is a deficient number, since it is larger than the sum of its proper divisors (113734652).

129538408 is a wasteful number, since it uses less digits than its factorization.

129538408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25908 (or 25904 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 129538408 is about 11381.4941022697. The cubic root of 129538408 is about 505.9794187237.

The spelling of 129538408 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, four hundred eight".