397631883687 has 32 divisors (see below), whose sum is σ = 566698277376. Its totient is φ = 247400630400.

The previous prime is 397631883659. The next prime is 397631883713. The reversal of 397631883687 is 786388136793.

It is not a de Polignac number, because 397631883687 - 2¹⁰ = 397631882663 is a prime.

It is a super-2 number, since 2×397631883687² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397631883637) by changing a digit.

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, 2720737 + ... + 2863157.

It is an arithmetic number, because the mean of its divisors is an integer number (17709321168).

Almost surely, 2^397631883687 is an apocalyptic number.

397631883687 is a deficient number, since it is larger than the sum of its proper divisors (169066393689).

397631883687 is a wasteful number, since it uses less digits than its factorization.

397631883687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143431.

The product of its digits is 219469824, while the sum is 69.

The spelling of 397631883687 in words is "three hundred ninety-seven billion, six hundred thirty-one million, eight hundred eighty-three thousand, six hundred eighty-seven".