396975647 has 4 divisors (see below), whose sum is σ = 397023696. Its totient is φ = 396927600.

The previous prime is 396975641. The next prime is 396975727. The reversal of 396975647 is 746579693.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 746579693 = 223 ⋅3347891.

It is a cyclic number.

It is not a de Polignac number, because 396975647 - 2⁸ = 396975391 is a prime.

It is a super-2 number, since 2×396975647² = 315179328622137218, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 396975592 and 396975601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396975641) 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, 8123 + ... + 29324.

It is an arithmetic number, because the mean of its divisors is an integer number (99255924).

Almost surely, 2^396975647 is an apocalyptic number.

396975647 is a deficient number, since it is larger than the sum of its proper divisors (48049).

396975647 is a wasteful number, since it uses less digits than its factorization.

396975647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48048.

The product of its digits is 8573040, while the sum is 56.

The square root of 396975647 is about 19924.2477147821. The cubic root of 396975647 is about 734.9446312433.

The spelling of 396975647 in words is "three hundred ninety-six million, nine hundred seventy-five thousand, six hundred forty-seven".