7656399 has 6 divisors (see below), whose sum is σ = 11059256. Its totient is φ = 5104260.

The previous prime is 7656379. The next prime is 7656413. The reversal of 7656399 is 9936567.

7656399 is a `hidden beast` number, since 7 + 6 + 5 + 639 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-7656399 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 (7656379) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 425347 + ... + 425364.

Almost surely, 2^7656399 is an apocalyptic number.

7656399 is a deficient number, since it is larger than the sum of its proper divisors (3402857).

7656399 is a wasteful number, since it uses less digits than its factorization.

7656399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850717 (or 850714 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 7656399 is about 2767.0198770518. The cubic root of 7656399 is about 197.0946576288.

The spelling of 7656399 in words is "seven million, six hundred fifty-six thousand, three hundred ninety-nine".