18261912 has 16 divisors (see below), whose sum is σ = 45654840. Its totient is φ = 6087296.

The previous prime is 18261889. The next prime is 18261913. The reversal of 18261912 is 21916281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18261912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380433 + ... + 380480.

Almost surely, 2^18261912 is an apocalyptic number.

18261912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18261912 is an abundant number, since it is smaller than the sum of its proper divisors (27392928).

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

18261912 is a wasteful number, since it uses less digits than its factorization.

18261912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760922 (or 760918 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 18261912 is about 4273.3958393765. The cubic root of 18261912 is about 263.3391413912.

The spelling of 18261912 in words is "eighteen million, two hundred sixty-one thousand, nine hundred twelve".