129142038 has 16 divisors (see below), whose sum is σ = 258395760. Its totient is φ = 43028736.

The previous prime is 129142021. The next prime is 129142043. The reversal of 129142038 is 830241921.

It is a junction number, because it is equal to n+sod(n) for n = 129141996 and 129142014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23278 + ... + 28286.

It is an arithmetic number, because the mean of its divisors is an integer number (16149735).

Almost surely, 2^129142038 is an apocalyptic number.

129142038 is an abundant number, since it is smaller than the sum of its proper divisors (129253722).

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

129142038 is a wasteful number, since it uses less digits than its factorization.

129142038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 129142038 is about 11364.0678456264. The cubic root of 129142038 is about 505.4628152677.

Adding to 129142038 its reverse (830241921), we get a palindrome (959383959).

The spelling of 129142038 in words is "one hundred twenty-nine million, one hundred forty-two thousand, thirty-eight".