11992780 has 24 divisors (see below), whose sum is σ = 25295760. Its totient is φ = 4776000.

The previous prime is 11992741. The next prime is 11992793. The reversal of 11992780 is 8729911.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3826 + ... + 6214.

It is an arithmetic number, because the mean of its divisors is an integer number (1053990).

Almost surely, 2^11992780 is an apocalyptic number.

11992780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11992780 is an abundant number, since it is smaller than the sum of its proper divisors (13302980).

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

11992780 is a wasteful number, since it uses less digits than its factorization.

11992780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649 (or 2647 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 11992780 is about 3463.0593411029. The cubic root of 11992780 is about 228.8969235388.

The spelling of 11992780 in words is "eleven million, nine hundred ninety-two thousand, seven hundred eighty".