402720236991 has 8 divisors (see below), whose sum is σ = 596622573360. Its totient is φ = 268480157976.

The previous prime is 402720236977. The next prime is 402720236999. The reversal of 402720236991 is 199632027204.

402720236991 is a `hidden beast` number, since 402 + 7 + 2 + 0 + 236 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 402720236991 - 2⁵ = 402720236959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402720236999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7457782140 + ... + 7457782193.

It is an arithmetic number, because the mean of its divisors is an integer number (74577821670).

Almost surely, 2^402720236991 is an apocalyptic number.

402720236991 is a deficient number, since it is larger than the sum of its proper divisors (193902336369).

402720236991 is a wasteful number, since it uses less digits than its factorization.

402720236991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14915564342 (or 14915564336 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 402720236991 in words is "four hundred two billion, seven hundred twenty million, two hundred thirty-six thousand, nine hundred ninety-one".