18135912 has 16 divisors (see below), whose sum is σ = 45339840. Its totient is φ = 6045296.

The previous prime is 18135907. The next prime is 18135917. The reversal of 18135912 is 21953181.

It is an interprime number because it is at equal distance from previous prime (18135907) and next prime (18135917).

It is a super-2 number, since 2×18135912² = 657822608143488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18135912.

It is not an unprimeable number, because it can be changed into a prime (18135917) 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, 377808 + ... + 377855.

It is an arithmetic number, because the mean of its divisors is an integer number (2833740).

Almost surely, 2^18135912 is an apocalyptic number.

18135912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18135912 is an abundant number, since it is smaller than the sum of its proper divisors (27203928).

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

18135912 is a wasteful number, since it uses less digits than its factorization.

18135912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755672 (or 755668 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 18135912 is about 4258.6279480603. The cubic root of 18135912 is about 262.7320976709.

The spelling of 18135912 in words is "eighteen million, one hundred thirty-five thousand, nine hundred twelve".