397451988 has 24 divisors (see below), whose sum is σ = 1030431360. Its totient is φ = 132483960.

The previous prime is 397451969. The next prime is 397452001. The reversal of 397451988 is 889154793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1839948 + ... + 1840163.

It is an arithmetic number, because the mean of its divisors is an integer number (42934640).

Almost surely, 2^397451988 is an apocalyptic number.

It is an amenable number.

397451988 is an abundant number, since it is smaller than the sum of its proper divisors (632979372).

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

397451988 is a wasteful number, since it uses less digits than its factorization.

397451988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680124 (or 3680116 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 397451988 is about 19936.1979324043. The cubic root of 397451988 is about 735.2384732221.

The spelling of 397451988 in words is "three hundred ninety-seven million, four hundred fifty-one thousand, nine hundred eighty-eight".