397385940 has 192 divisors, whose sum is σ = 1333075968. Its totient is φ = 86553600.

The previous prime is 397385917. The next prime is 397385951. The reversal of 397385940 is 49583793.

It is a self number, because there is not a number n which added to its sum of digits gives 397385940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 809095 + ... + 809585.

It is an arithmetic number, because the mean of its divisors is an integer number (6943104).

Almost surely, 2^397385940 is an apocalyptic number.

397385940 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 397385940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666537984).

397385940 is an abundant number, since it is smaller than the sum of its proper divisors (935690028).

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

397385940 is a wasteful number, since it uses less digits than its factorization.

397385940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 596 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 397385940 is about 19934.5413792242. The cubic root of 397385940 is about 735.1977440084.

The spelling of 397385940 in words is "three hundred ninety-seven million, three hundred eighty-five thousand, nine hundred forty".