12091988 has 12 divisors (see below), whose sum is σ = 21262752. Its totient is φ = 6016920.

The previous prime is 12091979. The next prime is 12092033. The reversal of 12091988 is 88919021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6320 + ... + 8007.

It is an arithmetic number, because the mean of its divisors is an integer number (1771896).

Almost surely, 2^12091988 is an apocalyptic number.

It is an amenable number.

12091988 is a deficient number, since it is larger than the sum of its proper divisors (9170764).

12091988 is a wasteful number, since it uses less digits than its factorization.

12091988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14542 (or 14540 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12091988 is about 3477.3535914543. The cubic root of 12091988 is about 229.5263598938.

The spelling of 12091988 in words is "twelve million, ninety-one thousand, nine hundred eighty-eight".