11491820 has 24 divisors (see below), whose sum is σ = 24206784. Its totient is φ = 4582656.

The previous prime is 11491807. The next prime is 11491841. The reversal of 11491820 is 2819411.

It is a self number, because there is not a number n which added to its sum of digits gives 11491820.

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, 7997 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (1008616).

Almost surely, 2^11491820 is an apocalyptic number.

11491820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11491820 is an abundant number, since it is smaller than the sum of its proper divisors (12714964).

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

11491820 is a wasteful number, since it uses less digits than its factorization.

11491820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 11491820 is about 3389.9587018133. The cubic root of 11491820 is about 225.6643410450.

The spelling of 11491820 in words is "eleven million, four hundred ninety-one thousand, eight hundred twenty".