397994160 has 40 divisors (see below), whose sum is σ = 1233782640. Its totient is φ = 106131712.

The previous prime is 397994153. The next prime is 397994161. The reversal of 397994160 is 61499793.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (397994161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828915 + ... + 829394.

It is an arithmetic number, because the mean of its divisors is an integer number (30844566).

Almost surely, 2^397994160 is an apocalyptic number.

397994160 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397994160 is an abundant number, since it is smaller than the sum of its proper divisors (835788480).

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

397994160 is a wasteful number, since it uses less digits than its factorization.

397994160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658325 (or 1658319 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 397994160 is about 19949.7909763486. The cubic root of 397994160 is about 735.5726390292.

The spelling of 397994160 in words is "three hundred ninety-seven million, nine hundred ninety-four thousand, one hundred sixty".