11975618 has 6 divisors (see below), whose sum is σ = 17970771. Its totient is φ = 5985362.

The previous prime is 11975609. The next prime is 11975653. The reversal of 11975618 is 81657911.

It can be written as a sum of positive squares in only one way, i.e., 5987809 + 5987809 = 2447^2 + 2447^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2447.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3671 + ... + 6117.

Almost surely, 2^11975618 is an apocalyptic number.

11975618 is a deficient number, since it is larger than the sum of its proper divisors (5995153).

11975618 is an frugal number, since it uses more digits than its factorization.

11975618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 2449 counting only the distinct ones).

The product of its digits is 15120, while the sum is 38.

The square root of 11975618 is about 3460.5805871270. The cubic root of 11975618 is about 228.7876854710.

The spelling of 11975618 in words is "eleven million, nine hundred seventy-five thousand, six hundred eighteen".