18949994 has 16 divisors (see below), whose sum is σ = 33364608. Its totient is φ = 7901712.

The previous prime is 18949993. The next prime is 18950003. The reversal of 18949994 is 49994981.

It is not an unprimeable number, because it can be changed into a prime (18949993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17774 + ... + 18809.

It is an arithmetic number, because the mean of its divisors is an integer number (2085288).

Almost surely, 2^18949994 is an apocalyptic number.

18949994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18949994 is a deficient number, since it is larger than the sum of its proper divisors (14414614).

18949994 is a wasteful number, since it uses less digits than its factorization.

18949994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36629.

The product of its digits is 839808, while the sum is 53.

The square root of 18949994 is about 4353.1590827811. The cubic root of 18949994 is about 266.6058607888.

The spelling of 18949994 in words is "eighteen million, nine hundred forty-nine thousand, nine hundred ninety-four".