397658571687 has 24 divisors (see below), whose sum is σ = 619527408864. Its totient is φ = 244338168384.

The previous prime is 397658571683. The next prime is 397658571733. The reversal of 397658571687 is 786175856793.

397658571687 is a `hidden beast` number, since 39 + 7 + 6 + 585 + 7 + 1 + 6 + 8 + 7 = 666.

It is not a de Polignac number, because 397658571687 - 2² = 397658571683 is a prime.

It is a super-2 number, since 2×397658571687² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397658571683) 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 23 ways as a sum of consecutive naturals, for example, 2526043 + ... + 2678844.

It is an arithmetic number, because the mean of its divisors is an integer number (25813642036).

Almost surely, 2^397658571687 is an apocalyptic number.

397658571687 is a deficient number, since it is larger than the sum of its proper divisors (221868837177).

397658571687 is a wasteful number, since it uses less digits than its factorization.

397658571687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205559 (or 5205556 counting only the distinct ones).

The product of its digits is 533433600, while the sum is 72.

The spelling of 397658571687 in words is "three hundred ninety-seven billion, six hundred fifty-eight million, five hundred seventy-one thousand, six hundred eighty-seven".