12015988 has 6 divisors (see below), whose sum is σ = 21027986. Its totient is φ = 6007992.

The previous prime is 12015977. The next prime is 12016013. The reversal of 12015988 is 88951021.

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 1954404 = 3172^2 + 1398^2 .

It is a super-2 number, since 2×12015988² = 288767935232288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1501995 + ... + 1502002.

Almost surely, 2^12015988 is an apocalyptic number.

It is an amenable number.

12015988 is a deficient number, since it is larger than the sum of its proper divisors (9011998).

12015988 is a wasteful number, since it uses less digits than its factorization.

12015988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004001 (or 3003999 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 12015988 is about 3466.4085160292. The cubic root of 12015988 is about 229.0444794514.

The spelling of 12015988 in words is "twelve million, fifteen thousand, nine hundred eighty-eight".