11821790 has 16 divisors (see below), whose sum is σ = 21422880. Its totient is φ = 4696800.

The previous prime is 11821787. The next prime is 11821841. The reversal of 11821790 is 9712811.

It is a super-3 number, since 3×11821790³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2405 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (1338930).

Almost surely, 2^11821790 is an apocalyptic number.

11821790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11821790 is a deficient number, since it is larger than the sum of its proper divisors (9601090).

11821790 is a wasteful number, since it uses less digits than its factorization.

11821790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7987.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 11821790 is about 3438.2830017321. The cubic root of 11821790 is about 227.8038607626.

The spelling of 11821790 in words is "eleven million, eight hundred twenty-one thousand, seven hundred ninety".