18939098 has 4 divisors (see below), whose sum is σ = 28408650. Its totient is φ = 9469548.

The previous prime is 18939083. The next prime is 18939103. The reversal of 18939098 is 89093981.

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

It can be written as a sum of positive squares in only one way, i.e., 10195249 + 8743849 = 3193^2 + 2957^2 .

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, 4734773 + ... + 4734776.

Almost surely, 2^18939098 is an apocalyptic number.

18939098 is a deficient number, since it is larger than the sum of its proper divisors (9469552).

18939098 is an equidigital number, since it uses as much as digits as its factorization.

18939098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469551.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 18939098 is about 4351.9073979119. The cubic root of 18939098 is about 266.5547526916.

The spelling of 18939098 in words is "eighteen million, nine hundred thirty-nine thousand, ninety-eight".