402851640 has 64 divisors (see below), whose sum is σ = 1210736160. Its totient is φ = 107233280.

The previous prime is 402851639. The next prime is 402851653. The reversal of 402851640 is 46158204.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 402851598 and 402851607.

It is a congruent number.

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, 71320 + ... + 76760.

Almost surely, 2^402851640 is an apocalyptic number.

402851640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402851640 is an abundant number, since it is smaller than the sum of its proper divisors (807884520).

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

402851640 is a wasteful number, since it uses less digits than its factorization.

402851640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072 (or 6068 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 402851640 is about 20071.1643907373. The cubic root of 402851640 is about 738.5530772276.

The spelling of 402851640 in words is "four hundred two million, eight hundred fifty-one thousand, six hundred forty".