18423996 has 36 divisors (see below), whose sum is σ = 45381672. Its totient is φ = 5816736.

The previous prime is 18423967. The next prime is 18424027. The reversal of 18423996 is 69932481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2206 + ... + 6458.

It is an arithmetic number, because the mean of its divisors is an integer number (1260602).

Almost surely, 2^18423996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18423996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22690836).

18423996 is an abundant number, since it is smaller than the sum of its proper divisors (26957676).

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

18423996 is a wasteful number, since it uses less digits than its factorization.

18423996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298 (or 4277 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 18423996 is about 4292.3182547430. The cubic root of 18423996 is about 264.1159385167.

The spelling of 18423996 in words is "eighteen million, four hundred twenty-three thousand, nine hundred ninety-six".