11813780 has 24 divisors (see below), whose sum is σ = 27064800. Its totient is φ = 4295840.

The previous prime is 11813741. The next prime is 11813797. The reversal of 11813780 is 8731811.

It is a congruent number.

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, 26630 + ... + 27069.

It is an arithmetic number, because the mean of its divisors is an integer number (1127700).

Almost surely, 2^11813780 is an apocalyptic number.

11813780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11813780 is an abundant number, since it is smaller than the sum of its proper divisors (15251020).

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

11813780 is a wasteful number, since it uses less digits than its factorization.

11813780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53719 (or 53717 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 11813780 is about 3437.1179787723. The cubic root of 11813780 is about 227.7523986970.

The spelling of 11813780 in words is "eleven million, eight hundred thirteen thousand, seven hundred eighty".