11815990 has 16 divisors (see below), whose sum is σ = 21481200. Its totient is φ = 4679200.

The previous prime is 11815961. The next prime is 11816009. The reversal of 11815990 is 9951811.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4840 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1342575).

Almost surely, 2^11815990 is an apocalyptic number.

11815990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11815990 is a deficient number, since it is larger than the sum of its proper divisors (9665210).

11815990 is a wasteful number, since it uses less digits than its factorization.

11815990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11807.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 11815990 is about 3437.4394540122. The cubic root of 11815990 is about 227.7665996674.

The spelling of 11815990 in words is "eleven million, eight hundred fifteen thousand, nine hundred ninety".