18936494 has 4 divisors (see below), whose sum is σ = 28404744. Its totient is φ = 9468246.

The previous prime is 18936451. The next prime is 18936517. The reversal of 18936494 is 49463981.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4734122 + ... + 4734125.

It is an arithmetic number, because the mean of its divisors is an integer number (7101186).

Almost surely, 2^18936494 is an apocalyptic number.

18936494 is a deficient number, since it is larger than the sum of its proper divisors (9468250).

18936494 is an equidigital number, since it uses as much as digits as its factorization.

18936494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9468249.

The product of its digits is 186624, while the sum is 44.

The square root of 18936494 is about 4351.6082084673. The cubic root of 18936494 is about 266.5425356298.

The spelling of 18936494 in words is "eighteen million, nine hundred thirty-six thousand, four hundred ninety-four".