11649618 has 12 divisors (see below), whose sum is σ = 25240878. Its totient is φ = 3883200.

The previous prime is 11649613. The next prime is 11649623. The reversal of 11649618 is 81694611.

It is a happy number.

11649618 is a `hidden beast` number, since 1 + 1 + 649 + 6 + 1 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (11649613) and next prime (11649623).

It can be written as a sum of positive squares in only one way, i.e., 8311689 + 3337929 = 2883^2 + 1827^2 .

It is not an unprimeable number, because it can be changed into a prime (11649611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323583 + ... + 323618.

Almost surely, 2^11649618 is an apocalyptic number.

11649618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11649618 is an abundant number, since it is smaller than the sum of its proper divisors (13591260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11649618 is a wasteful number, since it uses less digits than its factorization.

11649618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647209 (or 647206 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 11649618 is about 3413.1536736573. The cubic root of 11649618 is about 226.6925398186.

The spelling of 11649618 in words is "eleven million, six hundred forty-nine thousand, six hundred eighteen".