18599994 has 48 divisors (see below), whose sum is σ = 47141952. Its totient is φ = 5189184.

The previous prime is 18599983. The next prime is 18600047. The reversal of 18599994 is 49999581.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18599994.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3702 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (982124).

Almost surely, 2^18599994 is an apocalyptic number.

18599994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18599994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23570976).

18599994 is an abundant number, since it is smaller than the sum of its proper divisors (28541958).

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

18599994 is a wasteful number, since it uses less digits than its factorization.

18599994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491 (or 3488 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 18599994 is about 4312.7710349612. The cubic root of 18599994 is about 264.9542771477.

The spelling of 18599994 in words is "eighteen million, five hundred ninety-nine thousand, nine hundred ninety-four".