12381916 has 18 divisors (see below), whose sum is σ = 23020088. Its totient is φ = 5826240.

The previous prime is 12381911. The next prime is 12381931. The reversal of 12381916 is 61918321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4200 + ... + 6511.

Almost surely, 2^12381916 is an apocalyptic number.

It is an amenable number.

12381916 is a deficient number, since it is larger than the sum of its proper divisors (10638172).

12381916 is a wasteful number, since it uses less digits than its factorization.

12381916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10749 (or 10730 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 12381916 is about 3518.7946800005. The cubic root of 12381916 is about 231.3463318158.

The spelling of 12381916 in words is "twelve million, three hundred eighty-one thousand, nine hundred sixteen".