7999649 has 8 divisors (see below), whose sum is σ = 9178368. Its totient is φ = 6829920.

The previous prime is 7999637. The next prime is 7999669. The reversal of 7999649 is 9469997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7999649 - 2⁸ = 7999393 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 7999649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212 + ... + 4005.

It is an arithmetic number, because the mean of its divisors is an integer number (1147296).

Almost surely, 2^7999649 is an apocalyptic number.

It is an amenable number.

7999649 is a deficient number, since it is larger than the sum of its proper divisors (1178719).

7999649 is a wasteful number, since it uses less digits than its factorization.

7999649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495.

The product of its digits is 1102248, while the sum is 53.

The square root of 7999649 is about 2828.3650754455. The cubic root of 7999649 is about 199.9970749572.

The spelling of 7999649 in words is "seven million, nine hundred ninety-nine thousand, six hundred forty-nine".