402540925 has 6 divisors (see below), whose sum is σ = 499150778. Its totient is φ = 322032720.

The previous prime is 402540881. The next prime is 402540959. The reversal of 402540925 is 529045204.

It can be written as a sum of positive squares in 3 ways, for example, as 116186841 + 286354084 = 10779^2 + 16922^2 .

It is not a de Polignac number, because 402540925 - 2¹⁵ = 402508157 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 5 ways as a sum of consecutive naturals, for example, 8050794 + ... + 8050843.

Almost surely, 2^402540925 is an apocalyptic number.

It is an amenable number.

402540925 is a deficient number, since it is larger than the sum of its proper divisors (96609853).

402540925 is a wasteful number, since it uses less digits than its factorization.

402540925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16101647 (or 16101642 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 402540925 is about 20063.4225644579. The cubic root of 402540925 is about 738.3631491248.

The spelling of 402540925 in words is "four hundred two million, five hundred forty thousand, nine hundred twenty-five".