11889640 has 32 divisors (see below), whose sum is σ = 30574080. Its totient is φ = 4076352.

The previous prime is 11889607. The next prime is 11889641. The reversal of 11889640 is 4698811.

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 11889640.

It is not an unprimeable number, because it can be changed into a prime (11889641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20952 + ... + 21511.

It is an arithmetic number, because the mean of its divisors is an integer number (955440).

Almost surely, 2^11889640 is an apocalyptic number.

11889640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11889640 is an abundant number, since it is smaller than the sum of its proper divisors (18684440).

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

11889640 is a wasteful number, since it uses less digits than its factorization.

11889640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42481 (or 42477 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 11889640 is about 3448.1357281870. The cubic root of 11889640 is about 228.2388489086.

The spelling of 11889640 in words is "eleven million, eight hundred eighty-nine thousand, six hundred forty".