11919990 has 32 divisors (see below), whose sum is σ = 28740096. Its totient is φ = 3164000.

The previous prime is 11919989. The next prime is 11919991. The reversal of 11919990 is 9991911.

It is an interprime number because it is at equal distance from previous prime (11919989) and next prime (11919991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6739 + ... + 8321.

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

Almost surely, 2^11919990 is an apocalyptic number.

11919990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11919990 is an abundant number, since it is smaller than the sum of its proper divisors (16820106).

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

11919990 is a wasteful number, since it uses less digits than its factorization.

11919990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 11919990 is about 3452.5338521150. The cubic root of 11919990 is about 228.4328879576.

The spelling of 11919990 in words is "eleven million, nine hundred nineteen thousand, nine hundred ninety".