397956747 has 4 divisors (see below), whose sum is σ = 530609000. Its totient is φ = 265304496.

The previous prime is 397956743. The next prime is 397956773. The reversal of 397956747 is 747659793.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 397956747 - 2² = 397956743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397956743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66326122 + ... + 66326127.

It is an arithmetic number, because the mean of its divisors is an integer number (132652250).

Almost surely, 2^397956747 is an apocalyptic number.

397956747 is a deficient number, since it is larger than the sum of its proper divisors (132652253).

397956747 is a wasteful number, since it uses less digits than its factorization.

397956747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132652252.

The product of its digits is 10001880, while the sum is 57.

The square root of 397956747 is about 19948.8532753138. The cubic root of 397956747 is about 735.5495894100.

It can be divided in two parts, 3979 and 56747, that added together give a triangular number (60726 = T₃₄₈).

The spelling of 397956747 in words is "three hundred ninety-seven million, nine hundred fifty-six thousand, seven hundred forty-seven".