7978899 has 16 divisors (see below), whose sum is σ = 11383200. Its totient is φ = 4953600.

The previous prime is 7978889. The next prime is 7978903. The reversal of 7978899 is 9988797.

It is a happy number.

It is not a de Polignac number, because 7978899 - 2⁷ = 7978771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7978819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4377 + ... + 5925.

It is an arithmetic number, because the mean of its divisors is an integer number (711450).

Almost surely, 2^7978899 is an apocalyptic number.

7978899 is a deficient number, since it is larger than the sum of its proper divisors (3404301).

7978899 is a wasteful number, since it uses less digits than its factorization.

7978899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its digits is 2286144, while the sum is 57.

The square root of 7978899 is about 2824.6944967554. The cubic root of 7978899 is about 199.8240035049.

The spelling of 7978899 in words is "seven million, nine hundred seventy-eight thousand, eight hundred ninety-nine".