397669816 has 32 divisors (see below), whose sum is σ = 785640960. Its totient is φ = 188334432.

The previous prime is 397669813. The next prime is 397669819. The reversal of 397669816 is 618966793.

It is an interprime number because it is at equal distance from previous prime (397669813) and next prime (397669819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397669813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8461 + ... + 29443.

It is an arithmetic number, because the mean of its divisors is an integer number (24551280).

Almost surely, 2^397669816 is an apocalyptic number.

It is an amenable number.

397669816 is a deficient number, since it is larger than the sum of its proper divisors (387971144).

397669816 is a wasteful number, since it uses less digits than its factorization.

397669816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21115 (or 21111 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 55.

The square root of 397669816 is about 19941.6603120202. The cubic root of 397669816 is about 735.3727672430.

The spelling of 397669816 in words is "three hundred ninety-seven million, six hundred sixty-nine thousand, eight hundred sixteen".