397097728 has 18 divisors (see below), whose sum is σ = 792644804. Its totient is φ = 198548736.

The previous prime is 397097711. The next prime is 397097731. The reversal of 397097728 is 827790793.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775326 + ... + 775837.

Almost surely, 2^397097728 is an apocalyptic number.

It is an amenable number.

397097728 is a deficient number, since it is larger than the sum of its proper divisors (395547076).

397097728 is an equidigital number, since it uses as much as digits as its factorization.

397097728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551179 (or 1551165 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 52.

The square root of 397097728 is about 19927.3111081249. The cubic root of 397097728 is about 735.0199621277.

The spelling of 397097728 in words is "three hundred ninety-seven million, ninety-seven thousand, seven hundred twenty-eight".