397963947 has 4 divisors (see below), whose sum is σ = 530618600. Its totient is φ = 265309296.

The previous prime is 397963927. The next prime is 397963967. The reversal of 397963947 is 749369793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749369793 = 3 ⋅249789931.

It is an interprime number because it is at equal distance from previous prime (397963927) and next prime (397963967).

It is not a de Polignac number, because 397963947 - 2⁶ = 397963883 is a prime.

It is a super-2 number, since 2×397963947² = 316750606223637618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397963927) 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 3 ways as a sum of consecutive naturals, for example, 66327322 + ... + 66327327.

It is an arithmetic number, because the mean of its divisors is an integer number (132654650).

Almost surely, 2^397963947 is an apocalyptic number.

397963947 is a deficient number, since it is larger than the sum of its proper divisors (132654653).

397963947 is a wasteful number, since it uses less digits than its factorization.

397963947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132654652.

The product of its digits is 7715736, while the sum is 57.

The square root of 397963947 is about 19949.0337359983. The cubic root of 397963947 is about 735.5540253402.

The spelling of 397963947 in words is "three hundred ninety-seven million, nine hundred sixty-three thousand, nine hundred forty-seven".