397976919 has 16 divisors (see below), whose sum is σ = 563788512. Its totient is φ = 248849408.

The previous prime is 397976893. The next prime is 397976927. The reversal of 397976919 is 919679793.

It is a cyclic number.

It is not a de Polignac number, because 397976919 - 2¹⁶ = 397911383 is a prime.

It is a super-2 number, since 2×397976919² = 316771256113465122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397976519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1627 + ... + 28259.

It is an arithmetic number, because the mean of its divisors is an integer number (35236782).

Almost surely, 2^397976919 is an apocalyptic number.

397976919 is a deficient number, since it is larger than the sum of its proper divisors (165811593).

397976919 is a wasteful number, since it uses less digits than its factorization.

397976919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26946.

The product of its digits is 5786802, while the sum is 60.

The square root of 397976919 is about 19949.3588618782. The cubic root of 397976919 is about 735.5620172728.

The spelling of 397976919 in words is "three hundred ninety-seven million, nine hundred seventy-six thousand, nine hundred nineteen".