397651812 has 12 divisors (see below), whose sum is σ = 927854256. Its totient is φ = 132550600.

The previous prime is 397651801. The next prime is 397651841. The reversal of 397651812 is 218156793.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16568814 + ... + 16568837.

It is an arithmetic number, because the mean of its divisors is an integer number (77321188).

Almost surely, 2^397651812 is an apocalyptic number.

It is an amenable number.

397651812 is an abundant number, since it is smaller than the sum of its proper divisors (530202444).

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

397651812 is a wasteful number, since it uses less digits than its factorization.

397651812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33137658 (or 33137656 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The square root of 397651812 is about 19941.2088901350. The cubic root of 397651812 is about 735.3616693836.

The spelling of 397651812 in words is "three hundred ninety-seven million, six hundred fifty-one thousand, eight hundred twelve".