11871618 has 32 divisors (see below), whose sum is σ = 27267840. Its totient is φ = 3407760.

The previous prime is 11871617. The next prime is 11871619. The reversal of 11871618 is 81617811.

It is an interprime number because it is at equal distance from previous prime (11871617) and next prime (11871619).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (11871617) 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, 3480 + ... + 5987.

It is an arithmetic number, because the mean of its divisors is an integer number (852120).

Almost surely, 2^11871618 is an apocalyptic number.

11871618 is an abundant number, since it is smaller than the sum of its proper divisors (15396222).

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

11871618 is a wasteful number, since it uses less digits than its factorization.

11871618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502.

The product of its digits is 2688, while the sum is 33.

The square root of 11871618 is about 3445.5214409433. The cubic root of 11871618 is about 228.1234711351.

The spelling of 11871618 in words is "eleven million, eight hundred seventy-one thousand, six hundred eighteen".