11805990 has 64 divisors (see below), whose sum is σ = 34297344. Its totient is φ = 2539008.

The previous prime is 11805979. The next prime is 11806019. The reversal of 11805990 is 9950811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1917 + ... + 5223.

It is an arithmetic number, because the mean of its divisors is an integer number (535896).

Almost surely, 2^11805990 is an apocalyptic number.

11805990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11805990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17148672).

11805990 is an abundant number, since it is smaller than the sum of its proper divisors (22491354).

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

11805990 is a wasteful number, since it uses less digits than its factorization.

11805990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 11805990 is about 3435.9845750527. The cubic root of 11805990 is about 227.7023277546.

The spelling of 11805990 in words is "eleven million, eight hundred five thousand, nine hundred ninety".