11979940 has 24 divisors (see below), whose sum is σ = 28752192. Its totient is φ = 4107360.

The previous prime is 11979931. The next prime is 11979949. The reversal of 11979940 is 4997911.

It is a happy number.

11979940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11979931) and next prime (11979949).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 11979893 and 11979902.

It is not an unprimeable number, because it can be changed into a prime (11979949) 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, 42646 + ... + 42925.

It is an arithmetic number, because the mean of its divisors is an integer number (1198008).

Almost surely, 2^11979940 is an apocalyptic number.

11979940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11979940 is an abundant number, since it is smaller than the sum of its proper divisors (16772252).

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

11979940 is a wasteful number, since it uses less digits than its factorization.

11979940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85587 (or 85585 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 11979940 is about 3461.2049924846. The cubic root of 11979940 is about 228.8152053158.

The spelling of 11979940 in words is "eleven million, nine hundred seventy-nine thousand, nine hundred forty".