3129725 has 12 divisors (see below), whose sum is σ = 4050336. Its totient is φ = 2394480.

The previous prime is 3129701. The next prime is 3129733. The reversal of 3129725 is 5279213.

It is not a de Polignac number, because 3129725 - 2¹⁰ = 3128701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2147 + ... + 3296.

It is an arithmetic number, because the mean of its divisors is an integer number (337528).

Almost surely, 2^3129725 is an apocalyptic number.

It is an amenable number.

3129725 is a deficient number, since it is larger than the sum of its proper divisors (920611).

3129725 is a wasteful number, since it uses less digits than its factorization.

3129725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476 (or 5471 counting only the distinct ones).

The product of its digits is 3780, while the sum is 29.

The square root of 3129725 is about 1769.1028799931. The cubic root of 3129725 is about 146.2745350514.

The spelling of 3129725 in words is "three million, one hundred twenty-nine thousand, seven hundred twenty-five".