18917412 has 24 divisors (see below), whose sum is σ = 44491776. Its totient is φ = 6255648.

The previous prime is 18917389. The next prime is 18917417. The reversal of 18917412 is 21471981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18917417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4683 + ... + 7730.

It is an arithmetic number, because the mean of its divisors is an integer number (1853824).

Almost surely, 2^18917412 is an apocalyptic number.

18917412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18917412 is an abundant number, since it is smaller than the sum of its proper divisors (25574364).

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

18917412 is a wasteful number, since it uses less digits than its factorization.

18917412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12547 (or 12545 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 18917412 is about 4349.4151330955. The cubic root of 18917412 is about 266.4529753336.

The spelling of 18917412 in words is "eighteen million, nine hundred seventeen thousand, four hundred twelve".