396776647 has 4 divisors (see below), whose sum is σ = 397634080. Its totient is φ = 395919216.

The previous prime is 396776629. The next prime is 396776663. The reversal of 396776647 is 746677693.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396776647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396776687) 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, 428022 + ... + 428947.

It is an arithmetic number, because the mean of its divisors is an integer number (99408520).

Almost surely, 2^396776647 is an apocalyptic number.

396776647 is a deficient number, since it is larger than the sum of its proper divisors (857433).

396776647 is an equidigital number, since it uses as much as digits as its factorization.

396776647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857432.

The product of its digits is 8001504, while the sum is 55.

The square root of 396776647 is about 19919.2531737513. The cubic root of 396776647 is about 734.8218038709.

The spelling of 396776647 in words is "three hundred ninety-six million, seven hundred seventy-six thousand, six hundred forty-seven".