399290025 has 12 divisors (see below), whose sum is σ = 660159632. Its totient is φ = 212954640.

The previous prime is 399289991. The next prime is 399290029. The reversal of 399290025 is 520092993.

It is not a de Polignac number, because 399290025 - 2¹⁶ = 399224489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399290029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2661859 + ... + 2662008.

Almost surely, 2^399290025 is an apocalyptic number.

It is an amenable number.

399290025 is a deficient number, since it is larger than the sum of its proper divisors (260869607).

399290025 is a wasteful number, since it uses less digits than its factorization.

399290025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323880 (or 5323875 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 399290025 is about 19982.2427419947. The cubic root of 399290025 is about 736.3701131810.

The spelling of 399290025 in words is "three hundred ninety-nine million, two hundred ninety thousand, twenty-five".