397387644 has 12 divisors (see below), whose sum is σ = 927237864. Its totient is φ = 132462544.

The previous prime is 397387633. The next prime is 397387657. The reversal of 397387644 is 446783793.

It is a happy number.

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

It is a congruent number.

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, 16557807 + ... + 16557830.

It is an arithmetic number, because the mean of its divisors is an integer number (77269822).

Almost surely, 2^397387644 is an apocalyptic number.

It is an amenable number.

397387644 is an abundant number, since it is smaller than the sum of its proper divisors (529850220).

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

397387644 is a wasteful number, since it uses less digits than its factorization.

397387644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33115644 (or 33115642 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 51.

The square root of 397387644 is about 19934.5841190630. The cubic root of 397387644 is about 735.1987948552.

The spelling of 397387644 in words is "three hundred ninety-seven million, three hundred eighty-seven thousand, six hundred forty-four".