402401232440 has 32 divisors (see below), whose sum is σ = 906169520160. Its totient is φ = 160824182400.

The previous prime is 402401232421. The next prime is 402401232469. The reversal of 402401232440 is 44232104204.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4211876 + ... + 4306355.

It is an arithmetic number, because the mean of its divisors is an integer number (28317797505).

Almost surely, 2^402401232440 is an apocalyptic number.

402401232440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402401232440 is an abundant number, since it is smaller than the sum of its proper divisors (503768287720).

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

402401232440 is a wasteful number, since it uses less digits than its factorization.

402401232440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8519423 (or 8519419 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 402401232440 its reverse (44232104204), we get a palindrome (446633336644).

The spelling of 402401232440 in words is "four hundred two billion, four hundred one million, two hundred thirty-two thousand, four hundred forty".