18099942 has 64 divisors (see below), whose sum is σ = 44319744. Its totient is φ = 4815360.

The previous prime is 18099941. The next prime is 18099967. The reversal of 18099942 is 24999081.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 18099894 and 18099903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18099941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39378 + ... + 39834.

It is an arithmetic number, because the mean of its divisors is an integer number (692496).

Almost surely, 2^18099942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18099942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22159872).

18099942 is an abundant number, since it is smaller than the sum of its proper divisors (26219802).

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

18099942 is a wasteful number, since it uses less digits than its factorization.

18099942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 18099942 is about 4254.4026607739. The cubic root of 18099942 is about 262.5582854700.

The spelling of 18099942 in words is "eighteen million, ninety-nine thousand, nine hundred forty-two".