7999825 has 6 divisors (see below), whose sum is σ = 9919814. Its totient is φ = 6399840.

The previous prime is 7999813. The next prime is 7999847. The reversal of 7999825 is 5289997.

It can be written as a sum of positive squares in 3 ways, for example, as 595984 + 7403841 = 772^2 + 2721^2 .

It is not a de Polignac number, because 7999825 - 2⁵ = 7999793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159972 + ... + 160021.

Almost surely, 2^7999825 is an apocalyptic number.

It is an amenable number.

7999825 is a deficient number, since it is larger than the sum of its proper divisors (1919989).

7999825 is a wasteful number, since it uses less digits than its factorization.

7999825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320003 (or 319998 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The square root of 7999825 is about 2828.3961886553. The cubic root of 7999825 is about 199.9985416560.

The spelling of 7999825 in words is "seven million, nine hundred ninety-nine thousand, eight hundred twenty-five".