402925640 has 32 divisors (see below), whose sum is σ = 976321080. Its totient is φ = 148772352.

The previous prime is 402925637. The next prime is 402925657. The reversal of 402925640 is 46529204.

It can be written as a sum of positive squares in 4 ways, for example, as 270997444 + 131928196 = 16462^2 + 11486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402925597 and 402925606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386909 + ... + 387948.

Almost surely, 2^402925640 is an apocalyptic number.

402925640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402925640 is an abundant number, since it is smaller than the sum of its proper divisors (573395440).

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

402925640 is a wasteful number, since it uses less digits than its factorization.

402925640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774881 (or 774877 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 402925640 is about 20073.0077467230. The cubic root of 402925640 is about 738.5982961752.

The spelling of 402925640 in words is "four hundred two million, nine hundred twenty-five thousand, six hundred forty".