7979890 has 16 divisors (see below), whose sum is σ = 14497560. Its totient is φ = 3162240.

The previous prime is 7979863. The next prime is 7979891. The reversal of 7979890 is 989797.

It can be written as a sum of positive squares in 4 ways, for example, as 4297329 + 3682561 = 2073^2 + 1919^2 .

It is not an unprimeable number, because it can be changed into a prime (7979891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2571 + ... + 4750.

Almost surely, 2^7979890 is an apocalyptic number.

7979890 is a deficient number, since it is larger than the sum of its proper divisors (6517670).

7979890 is a wasteful number, since it uses less digits than its factorization.

7979890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7437.

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 7979890 is about 2824.8699085091. The cubic root of 7979890 is about 199.8322760494.

The spelling of 7979890 in words is "seven million, nine hundred seventy-nine thousand, eight hundred ninety".