18816042 has 96 divisors (see below), whose sum is σ = 48719232. Its totient is φ = 4727808.

The previous prime is 18816029. The next prime is 18816073. The reversal of 18816042 is 24061881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 257718 + ... + 257790.

It is an arithmetic number, because the mean of its divisors is an integer number (507492).

Almost surely, 2^18816042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18816042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24359616).

18816042 is an abundant number, since it is smaller than the sum of its proper divisors (29903190).

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

18816042 is a wasteful number, since it uses less digits than its factorization.

18816042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18816042 is about 4337.7461889788. The cubic root of 18816042 is about 265.9761883447.

The spelling of 18816042 in words is "eighteen million, eight hundred sixteen thousand, forty-two".