7901998 has 16 divisors (see below), whose sum is σ = 12818736. Its totient is φ = 3631680.

The previous prime is 7901989. The next prime is 7902017. The reversal of 7901998 is 8991097.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7653 + ... + 8623.

It is an arithmetic number, because the mean of its divisors is an integer number (801171).

Almost surely, 2^7901998 is an apocalyptic number.

7901998 is a deficient number, since it is larger than the sum of its proper divisors (4916738).

7901998 is a wasteful number, since it uses less digits than its factorization.

7901998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 7901998 is about 2811.0492702904. The cubic root of 7901998 is about 199.1799589253.

The spelling of 7901998 in words is "seven million, nine hundred one thousand, nine hundred ninety-eight".