11881620 has 48 divisors (see below), whose sum is σ = 36966720. Its totient is φ = 3168288.

The previous prime is 11881591. The next prime is 11881673. The reversal of 11881620 is 2618811.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10462 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (770140).

Almost surely, 2^11881620 is an apocalyptic number.

11881620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11881620 is an abundant number, since it is smaller than the sum of its proper divisors (25085100).

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

11881620 is a wasteful number, since it uses less digits than its factorization.

11881620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22021 (or 22013 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 11881620 is about 3446.9725847474. The cubic root of 11881620 is about 228.1875188628.

The spelling of 11881620 in words is "eleven million, eight hundred eighty-one thousand, six hundred twenty".