397474440 has 128 divisors (see below), whose sum is σ = 1311621120. Its totient is φ = 95558400.

The previous prime is 397474439. The next prime is 397474487. The reversal of 397474440 is 44474793.

It is a junction number, because it is equal to n+sod(n) for n = 397474392 and 397474401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166455 + ... + 168825.

It is an arithmetic number, because the mean of its divisors is an integer number (10247040).

Almost surely, 2^397474440 is an apocalyptic number.

397474440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397474440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655810560).

397474440 is an abundant number, since it is smaller than the sum of its proper divisors (914146680).

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

397474440 is a wasteful number, since it uses less digits than its factorization.

397474440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The square root of 397474440 is about 19936.7610207877. The cubic root of 397474440 is about 735.2523174632.

The spelling of 397474440 in words is "three hundred ninety-seven million, four hundred seventy-four thousand, four hundred forty".