18423900 has 108 divisors (see below), whose sum is σ = 63032424. Its totient is φ = 4464000.

The previous prime is 18423893. The next prime is 18423907. The reversal of 18423900 is 932481.

It is an interprime number because it is at equal distance from previous prime (18423893) and next prime (18423907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423907) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8970 + ... + 10830.

Almost surely, 2^18423900 is an apocalyptic number.

18423900 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 18423900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31516212).

18423900 is an abundant number, since it is smaller than the sum of its proper divisors (44608524).

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

18423900 is a wasteful number, since it uses less digits than its factorization.

18423900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18423900 is about 4292.3070719603. The cubic root of 18423900 is about 264.1154797821.

The spelling of 18423900 in words is "eighteen million, four hundred twenty-three thousand, nine hundred".