397975736 has 8 divisors (see below), whose sum is σ = 746204520. Its totient is φ = 198987864.

The previous prime is 397975733. The next prime is 397975757. The reversal of 397975736 is 637579793.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397975733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24873476 + ... + 24873491.

It is an arithmetic number, because the mean of its divisors is an integer number (93275565).

Almost surely, 2^397975736 is an apocalyptic number.

It is an amenable number.

397975736 is a deficient number, since it is larger than the sum of its proper divisors (348228784).

397975736 is a wasteful number, since it uses less digits than its factorization.

397975736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49746973 (or 49746969 counting only the distinct ones).

The product of its digits is 7501410, while the sum is 56.

The square root of 397975736 is about 19949.3292117805. The cubic root of 397975736 is about 735.5612884444.

It can be divided in two parts, 3979757 and 36, that added together give a palindrome (3979793).

The spelling of 397975736 in words is "three hundred ninety-seven million, nine hundred seventy-five thousand, seven hundred thirty-six".