12381988 has 6 divisors (see below), whose sum is σ = 21668486. Its totient is φ = 6190992.

The previous prime is 12381983. The next prime is 12381991. The reversal of 12381988 is 88918321.

It can be written as a sum of positive squares in only one way, i.e., 10510564 + 1871424 = 3242^2 + 1368^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12381988.

It is not an unprimeable number, because it can be changed into a prime (12381983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1547745 + ... + 1547752.

Almost surely, 2^12381988 is an apocalyptic number.

It is an amenable number.

12381988 is a deficient number, since it is larger than the sum of its proper divisors (9286498).

12381988 is a wasteful number, since it uses less digits than its factorization.

12381988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095501 (or 3095499 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 12381988 is about 3518.8049107616. The cubic root of 12381988 is about 231.3467802360.

The spelling of 12381988 in words is "twelve million, three hundred eighty-one thousand, nine hundred eighty-eight".