11899980 has 48 divisors (see below), whose sum is σ = 37023840. Its totient is φ = 3173184.

The previous prime is 11899969. The next prime is 11899981. The reversal of 11899980 is 8999811.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11899981) by changing a digit.

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, 10479 + ... + 11558.

It is an arithmetic number, because the mean of its divisors is an integer number (771330).

Almost surely, 2^11899980 is an apocalyptic number.

11899980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11899980 is an abundant number, since it is smaller than the sum of its proper divisors (25123860).

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

11899980 is a wasteful number, since it uses less digits than its factorization.

11899980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22055 (or 22047 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 11899980 is about 3449.6347632757. The cubic root of 11899980 is about 228.3049934932.

It can be divided in two parts, 1 and 1899980, that added together give a palindrome (1899981).

The spelling of 11899980 in words is "eleven million, eight hundred ninety-nine thousand, nine hundred eighty".