12121590 has 32 divisors (see below), whose sum is σ = 31330656. Its totient is φ = 2983680.

The previous prime is 12121583. The next prime is 12121619. The reversal of 12121590 is 9512121.

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, 15151 + ... + 15930.

It is an arithmetic number, because the mean of its divisors is an integer number (979083).

Almost surely, 2^12121590 is an apocalyptic number.

12121590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121590 is an abundant number, since it is smaller than the sum of its proper divisors (19209066).

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

12121590 is a wasteful number, since it uses less digits than its factorization.

12121590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31104.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12121590 is about 3481.6073874003. The cubic root of 12121590 is about 229.7135059175.

The spelling of 12121590 in words is "twelve million, one hundred twenty-one thousand, five hundred ninety".