18426660 has 96 divisors (see below), whose sum is σ = 59872512. Its totient is φ = 4147200.

The previous prime is 18426659. The next prime is 18426673. The reversal of 18426660 is 6662481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30360 + ... + 30960.

It is an arithmetic number, because the mean of its divisors is an integer number (623672).

Almost surely, 2^18426660 is an apocalyptic number.

18426660 is a gapful number since it is divisible by the number (10) 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 18426660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29936256).

18426660 is an abundant number, since it is smaller than the sum of its proper divisors (41445852).

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

18426660 is a wasteful number, since it uses less digits than its factorization.

18426660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18426660 is about 4292.6285653432. The cubic root of 18426660 is about 264.1286677667.

The spelling of 18426660 in words is "eighteen million, four hundred twenty-six thousand, six hundred sixty".