3129865725 has 96 divisors (see below), whose sum is σ = 6370862080. Its totient is φ = 1323786240.

The previous prime is 3129865721. The next prime is 3129865727. The reversal of 3129865725 is 5275689213.

It is not a de Polignac number, because 3129865725 - 2² = 3129865721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129865721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 425277 + ... + 432573.

Almost surely, 2^3129865725 is an apocalyptic number.

3129865725 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3129865725 is an abundant number, since it is smaller than the sum of its proper divisors (3240996355).

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

3129865725 is a wasteful number, since it uses less digits than its factorization.

3129865725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379 (or 7374 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 3129865725 is about 55945.2028774586. The cubic root of 3129865725 is about 1462.7672738202.

The spelling of 3129865725 in words is "three billion, one hundred twenty-nine million, eight hundred sixty-five thousand, seven hundred twenty-five".