11513780 has 12 divisors (see below), whose sum is σ = 24178980. Its totient is φ = 4605504.

The previous prime is 11513729. The next prime is 11513797. The reversal of 11513780 is 8731511.

It can be written as a sum of positive squares in 2 ways, for example, as 1196836 + 10316944 = 1094^2 + 3212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287825 + ... + 287864.

It is an arithmetic number, because the mean of its divisors is an integer number (2014915).

Almost surely, 2^11513780 is an apocalyptic number.

11513780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11513780 is an abundant number, since it is smaller than the sum of its proper divisors (12665200).

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

11513780 is a wasteful number, since it uses less digits than its factorization.

11513780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575698 (or 575696 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 11513780 is about 3393.1961334412. The cubic root of 11513780 is about 225.8079920852.

The spelling of 11513780 in words is "eleven million, five hundred thirteen thousand, seven hundred eighty".