18609912 has 56 divisors (see below), whose sum is σ = 52332840. Its totient is φ = 6201360.

The previous prime is 18609869. The next prime is 18609919. The reversal of 18609912 is 21990681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18609919) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4237 + ... + 7427.

It is an arithmetic number, because the mean of its divisors is an integer number (934515).

Almost surely, 2^18609912 is an apocalyptic number.

18609912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18609912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26166420).

18609912 is an abundant number, since it is smaller than the sum of its proper divisors (33722928).

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

18609912 is an equidigital number, since it uses as much as digits as its factorization.

18609912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215 (or 3196 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 18609912 is about 4313.9207224983. The cubic root of 18609912 is about 265.0013622809.

The spelling of 18609912 in words is "eighteen million, six hundred nine thousand, nine hundred twelve".