402877640 has 32 divisors (see below), whose sum is σ = 988882560. Its totient is φ = 146500800.

The previous prime is 402877619. The next prime is 402877663. The reversal of 402877640 is 46778204.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 402877594 and 402877603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457376 + ... + 458255.

It is an arithmetic number, because the mean of its divisors is an integer number (30902580).

Almost surely, 2^402877640 is an apocalyptic number.

402877640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402877640 is an abundant number, since it is smaller than the sum of its proper divisors (586004920).

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

402877640 is a wasteful number, since it uses less digits than its factorization.

402877640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915653 (or 915649 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 402877640 is about 20071.8120756448. The cubic root of 402877640 is about 738.5689655969.

The spelling of 402877640 in words is "four hundred two million, eight hundred seventy-seven thousand, six hundred forty".