7997618 has 4 divisors (see below), whose sum is σ = 11996430. Its totient is φ = 3998808.

The previous prime is 7997581. The next prime is 7997621. The reversal of 7997618 is 8167997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8167997 = 683 ⋅11959.

It can be written as a sum of positive squares in only one way, i.e., 7579009 + 418609 = 2753^2 + 647^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999403 + ... + 1999406.

Almost surely, 2^7997618 is an apocalyptic number.

7997618 is a deficient number, since it is larger than the sum of its proper divisors (3998812).

7997618 is a wasteful number, since it uses less digits than its factorization.

7997618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998811.

The product of its digits is 190512, while the sum is 47.

The square root of 7997618 is about 2828.0060113090. The cubic root of 7997618 is about 199.9801480296.

The spelling of 7997618 in words is "seven million, nine hundred ninety-seven thousand, six hundred eighteen".