397817212 has 72 divisors (see below), whose sum is σ = 811641600. Its totient is φ = 169985088.

The previous prime is 397817183. The next prime is 397817227. The reversal of 397817212 is 212718793.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 603339 + ... + 603997.

It is an arithmetic number, because the mean of its divisors is an integer number (11272800).

Almost surely, 2^397817212 is an apocalyptic number.

It is an amenable number.

397817212 is an abundant number, since it is smaller than the sum of its proper divisors (413824388).

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

397817212 is a wasteful number, since it uses less digits than its factorization.

397817212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 740 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 397817212 is about 19945.3556498750. The cubic root of 397817212 is about 735.4636111300.

The spelling of 397817212 in words is "three hundred ninety-seven million, eight hundred seventeen thousand, two hundred twelve".