11899780 has 12 divisors (see below), whose sum is σ = 24989580. Its totient is φ = 4759904.

The previous prime is 11899759. The next prime is 11899787. The reversal of 11899780 is 8799811.

It can be written as a sum of positive squares in 2 ways, for example, as 7311616 + 4588164 = 2704^2 + 2142^2 .

It is not an unprimeable number, because it can be changed into a prime (11899787) 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 3 ways as a sum of consecutive naturals, for example, 297475 + ... + 297514.

It is an arithmetic number, because the mean of its divisors is an integer number (2082465).

Almost surely, 2^11899780 is an apocalyptic number.

11899780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11899780 is an abundant number, since it is smaller than the sum of its proper divisors (13089800).

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

11899780 is a wasteful number, since it uses less digits than its factorization.

11899780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594998 (or 594996 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 11899780 is about 3449.6057745777. The cubic root of 11899780 is about 228.3037144643.

The spelling of 11899780 in words is "eleven million, eight hundred ninety-nine thousand, seven hundred eighty".