396691649 has 4 divisors (see below), whose sum is σ = 413939136. Its totient is φ = 379444164.

The previous prime is 396691637. The next prime is 396691661. The reversal of 396691649 is 946196693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (396691637) and next prime (396691661).

It is a cyclic number.

It is not a de Polignac number, because 396691649 - 2¹² = 396687553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 396691649.

It is not an unprimeable number, because it can be changed into a prime (396691699) 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, 8623709 + ... + 8623754.

It is an arithmetic number, because the mean of its divisors is an integer number (103484784).

Almost surely, 2^396691649 is an apocalyptic number.

It is an amenable number.

396691649 is a deficient number, since it is larger than the sum of its proper divisors (17247487).

396691649 is a wasteful number, since it uses less digits than its factorization.

396691649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17247486.

The product of its digits is 1889568, while the sum is 53.

The square root of 396691649 is about 19917.1194955496. The cubic root of 396691649 is about 734.7693286352.

The spelling of 396691649 in words is "three hundred ninety-six million, six hundred ninety-one thousand, six hundred forty-nine".