12015990 has 48 divisors (see below), whose sum is σ = 35706528. Its totient is φ = 2746368.

The previous prime is 12015977. The next prime is 12016013. The reversal of 12015990 is 9951021.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8907 + ... + 10166.

It is an arithmetic number, because the mean of its divisors is an integer number (743886).

Almost surely, 2^12015990 is an apocalyptic number.

12015990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12015990 is an abundant number, since it is smaller than the sum of its proper divisors (23690538).

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

12015990 is a wasteful number, since it uses less digits than its factorization.

12015990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19093 (or 19090 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 12015990 is about 3466.4088045122. The cubic root of 12015990 is about 229.0444921592.

Subtracting from 12015990 its reverse (9951021), we obtain a square (2064969 = 1437²).

It can be divided in two parts, 120 and 15990, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 12015990 in words is "twelve million, fifteen thousand, nine hundred ninety".