11881990 has 16 divisors (see below), whose sum is σ = 22078080. Its totient is φ = 4599360.

The previous prime is 11881957. The next prime is 11882071. The reversal of 11881990 is 9918811.

11881990 = T₈₆₀ + T₈₆₁ + ... + T₈₉₀.

It is a happy number.

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, 18855 + ... + 19474.

It is an arithmetic number, because the mean of its divisors is an integer number (1379880).

Almost surely, 2^11881990 is an apocalyptic number.

11881990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11881990 is a deficient number, since it is larger than the sum of its proper divisors (10196090).

11881990 is a wasteful number, since it uses less digits than its factorization.

11881990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38367.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 11881990 is about 3447.0262546143. The cubic root of 11881990 is about 228.1898874653.

The spelling of 11881990 in words is "eleven million, eight hundred eighty-one thousand, nine hundred ninety".