3999025 has 12 divisors (see below), whose sum is σ = 5220400. Its totient is φ = 3030480.

The previous prime is 3999001. The next prime is 3999053. The reversal of 3999025 is 5209993.

It is not a de Polignac number, because 3999025 - 2⁵ = 3998993 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 3735 + ... + 4684.

Almost surely, 2^3999025 is an apocalyptic number.

It is an amenable number.

3999025 is a deficient number, since it is larger than the sum of its proper divisors (1221375).

3999025 is a wasteful number, since it uses less digits than its factorization.

3999025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8448 (or 8443 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 3999025 is about 1999.7562351447. The cubic root of 3999025 is about 158.7272065152.

The spelling of 3999025 in words is "three million, nine hundred ninety-nine thousand, twenty-five".