397808632390 has 64 divisors (see below), whose sum is σ = 784946635200. Its totient is φ = 144259914240.

The previous prime is 397808632381. The next prime is 397808632423. The reversal of 397808632390 is 93236808793.

It is a super-2 number, since 2×397808632390² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5331561 + ... + 5405659.

It is an arithmetic number, because the mean of its divisors is an integer number (12264791175).

Almost surely, 2^397808632390 is an apocalyptic number.

397808632390 is a deficient number, since it is larger than the sum of its proper divisors (387138002810).

397808632390 is a wasteful number, since it uses less digits than its factorization.

397808632390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74857.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 397808632390 in words is "three hundred ninety-seven billion, eight hundred eight million, six hundred thirty-two thousand, three hundred ninety".