397819656 has 96 divisors (see below), whose sum is σ = 1185125760. Its totient is φ = 119788416.

The previous prime is 397819649. The next prime is 397819657. The reversal of 397819656 is 656918793.

It is not an unprimeable number, because it can be changed into a prime (397819657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39471 + ... + 48513.

It is an arithmetic number, because the mean of its divisors is an integer number (12345060).

Almost surely, 2^397819656 is an apocalyptic number.

397819656 is a gapful number since it is divisible by the number (36) 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 397819656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592562880).

397819656 is an abundant number, since it is smaller than the sum of its proper divisors (787306104).

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

397819656 is a wasteful number, since it uses less digits than its factorization.

397819656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115 (or 9108 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 397819656 is about 19945.4169171767. The cubic root of 397819656 is about 735.4651172399.

The spelling of 397819656 in words is "three hundred ninety-seven million, eight hundred nineteen thousand, six hundred fifty-six".