402440822640 has 60 divisors (see below), whose sum is σ = 1351530431784. Its totient is φ = 107317552512.

The previous prime is 402440822627. The next prime is 402440822711. The reversal of 402440822640 is 46228044204.

It is a happy number.

402440822640 is a `hidden beast` number, since 4 + 0 + 2 + 4 + 4 + 0 + 8 + 2 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 402440822595 and 402440822604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279472074 + ... + 279473513.

Almost surely, 2^402440822640 is an apocalyptic number.

402440822640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402440822640 is an abundant number, since it is smaller than the sum of its proper divisors (949089609144).

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

402440822640 is a wasteful number, since it uses less digits than its factorization.

402440822640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558945606 (or 558945597 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 36.

Adding to 402440822640 its reverse (46228044204), we get a palindrome (448668866844).

The spelling of 402440822640 in words is "four hundred two billion, four hundred forty million, eight hundred twenty-two thousand, six hundred forty".