11921860 has 12 divisors (see below), whose sum is σ = 25035948. Its totient is φ = 4768736.

The previous prime is 11921851. The next prime is 11921867. The reversal of 11921860 is 6812911.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 3992004 = 2816^2 + 1998^2 .

It is not an unprimeable number, because it can be changed into a prime (11921867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298027 + ... + 298066.

It is an arithmetic number, because the mean of its divisors is an integer number (2086329).

Almost surely, 2^11921860 is an apocalyptic number.

11921860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11921860 is an abundant number, since it is smaller than the sum of its proper divisors (13114088).

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

11921860 is a wasteful number, since it uses less digits than its factorization.

11921860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596102 (or 596100 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 11921860 is about 3452.8046570868. The cubic root of 11921860 is about 228.4448327988. Note that the first 3 decimals are identical.

The spelling of 11921860 in words is "eleven million, nine hundred twenty-one thousand, eight hundred sixty".