397397191015 has 16 divisors (see below), whose sum is σ = 532917566496. Its totient is φ = 281966963200.

The previous prime is 397397190947. The next prime is 397397191033. The reversal of 397397191015 is 510191793793.

It is not a de Polignac number, because 397397191015 - 2³³ = 388807256423 is a prime.

It is a super-2 number, since 2×397397191015² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88112422 + ... + 88116931.

It is an arithmetic number, because the mean of its divisors is an integer number (33307347906).

Almost surely, 2^397397191015 is an apocalyptic number.

397397191015 is a deficient number, since it is larger than the sum of its proper divisors (135520375481).

397397191015 is a wasteful number, since it uses less digits than its factorization.

397397191015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176229410.

The product of its (nonzero) digits is 1607445, while the sum is 55.

The spelling of 397397191015 in words is "three hundred ninety-seven billion, three hundred ninety-seven million, one hundred ninety-one thousand, fifteen".