397976985 has 96 divisors (see below), whose sum is σ = 812148480. Its totient is φ = 176546304.

The previous prime is 397976927. The next prime is 397977011. The reversal of 397976985 is 589679793.

It is not a de Polignac number, because 397976985 - 2¹⁴ = 397960601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2300359 + ... + 2300531.

It is an arithmetic number, because the mean of its divisors is an integer number (8459880).

Almost surely, 2^397976985 is an apocalyptic number.

397976985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

397976985 is an abundant number, since it is smaller than the sum of its proper divisors (414171495).

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

397976985 is a wasteful number, since it uses less digits than its factorization.

397976985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 364 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The square root of 397976985 is about 19949.3605160667. The cubic root of 397976985 is about 735.5620579344.

The spelling of 397976985 in words is "three hundred ninety-seven million, nine hundred seventy-six thousand, nine hundred eighty-five".