11921790 has 32 divisors (see below), whose sum is σ = 28740096. Its totient is φ = 3164960.

The previous prime is 11921773. The next prime is 11921827. The reversal of 11921790 is 9712911.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7135 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (898128).

Almost surely, 2^11921790 is an apocalyptic number.

11921790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11921790 is an abundant number, since it is smaller than the sum of its proper divisors (16818306).

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

11921790 is a wasteful number, since it uses less digits than its factorization.

11921790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 11921790 is about 3452.7945203849. The cubic root of 11921790 is about 228.4443856882. Note that the first 3 decimals are identical.

The spelling of 11921790 in words is "eleven million, nine hundred twenty-one thousand, seven hundred ninety".