129260638 has 16 divisors (see below), whose sum is σ = 215542656. Its totient is φ = 57733920.

The previous prime is 129260633. The next prime is 129260641. The reversal of 129260638 is 836062921.

It is a junction number, because it is equal to n+sod(n) for n = 129260597 and 129260606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129260633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79381 + ... + 80992.

It is an arithmetic number, because the mean of its divisors is an integer number (13471416).

Almost surely, 2^129260638 is an apocalyptic number.

129260638 is a deficient number, since it is larger than the sum of its proper divisors (86282018).

129260638 is a wasteful number, since it uses less digits than its factorization.

129260638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160419.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 129260638 is about 11369.2848499807. The cubic root of 129260638 is about 505.6175016599.

The spelling of 129260638 in words is "one hundred twenty-nine million, two hundred sixty thousand, six hundred thirty-eight".