402557985 has 16 divisors (see below), whose sum is σ = 715658880. Its totient is φ = 214697520.

The previous prime is 402557957. The next prime is 402557999. The reversal of 402557985 is 589755204.

402557985 is a `hidden beast` number, since 4 + 0 + 2 + 557 + 98 + 5 = 666.

It is not a de Polignac number, because 402557985 - 2⁹ = 402557473 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 402557985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1490821 + ... + 1491090.

It is an arithmetic number, because the mean of its divisors is an integer number (44728680).

Almost surely, 2^402557985 is an apocalyptic number.

402557985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

402557985 is a deficient number, since it is larger than the sum of its proper divisors (313100895).

402557985 is a wasteful number, since it uses less digits than its factorization.

402557985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981925 (or 2981919 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 402557985 is about 20063.8477117426. The cubic root of 402557985 is about 738.3735797805.

The spelling of 402557985 in words is "four hundred two million, five hundred fifty-seven thousand, nine hundred eighty-five".