129523438 has 16 divisors (see below), whose sum is σ = 212446080. Its totient is φ = 58735800.

The previous prime is 129523417. The next prime is 129523441. The reversal of 129523438 is 834325921.

It is a junction number, because it is equal to n+sod(n) for n = 129523397 and 129523406.

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, 2953 + ... + 16363.

It is an arithmetic number, because the mean of its divisors is an integer number (13277880).

Almost surely, 2^129523438 is an apocalyptic number.

129523438 is a deficient number, since it is larger than the sum of its proper divisors (82922642).

129523438 is a wasteful number, since it uses less digits than its factorization.

129523438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13863.

The product of its digits is 51840, while the sum is 37.

The square root of 129523438 is about 11380.8364367475. The cubic root of 129523438 is about 505.9599269405.

The spelling of 129523438 in words is "one hundred twenty-nine million, five hundred twenty-three thousand, four hundred thirty-eight".