397556670 has 64 divisors (see below), whose sum is σ = 1092372480. Its totient is φ = 90709248.

The previous prime is 397556659. The next prime is 397556683. The reversal of 397556670 is 76655793.

It is a happy number.

It is a super-2 number, since 2×397556670² = 316102611722977800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 149674 + ... + 152306.

It is an arithmetic number, because the mean of its divisors is an integer number (17068320).

Almost surely, 2^397556670 is an apocalyptic number.

397556670 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

397556670 is an abundant number, since it is smaller than the sum of its proper divisors (694815810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397556670 is a wasteful number, since it uses less digits than its factorization.

397556670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369.

The product of its (nonzero) digits is 1190700, while the sum is 48.

The square root of 397556670 is about 19938.8231849325. The cubic root of 397556670 is about 735.3030172677.

The spelling of 397556670 in words is "three hundred ninety-seven million, five hundred fifty-six thousand, six hundred seventy".