129825436 has 12 divisors (see below), whose sum is σ = 244671112. Its totient is φ = 59919408.

The previous prime is 129825433. The next prime is 129825439. The reversal of 129825436 is 634528921.

It is an interprime number because it is at equal distance from previous prime (129825433) and next prime (129825439).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129825433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248270 + ... + 1248373.

Almost surely, 2^129825436 is an apocalyptic number.

It is an amenable number.

129825436 is a deficient number, since it is larger than the sum of its proper divisors (114845676).

129825436 is a wasteful number, since it uses less digits than its factorization.

129825436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496660 (or 2496658 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 129825436 is about 11394.0965416307. The cubic root of 129825436 is about 506.3528552686.

The spelling of 129825436 in words is "one hundred twenty-nine million, eight hundred twenty-five thousand, four hundred thirty-six".