18939094 has 4 divisors (see below), whose sum is σ = 28408644. Its totient is φ = 9469546.

The previous prime is 18939083. The next prime is 18939103. The reversal of 18939094 is 49093981.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18939094.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4734772 + ... + 4734775.

It is an arithmetic number, because the mean of its divisors is an integer number (7102161).

Almost surely, 2^18939094 is an apocalyptic number.

18939094 is a deficient number, since it is larger than the sum of its proper divisors (9469550).

18939094 is an equidigital number, since it uses as much as digits as its factorization.

18939094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469549.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 18939094 is about 4351.9069383432. The cubic root of 18939094 is about 266.5547339258.

The spelling of 18939094 in words is "eighteen million, nine hundred thirty-nine thousand, ninety-four".