18693394 has 4 divisors (see below), whose sum is σ = 28040094. Its totient is φ = 9346696.

The previous prime is 18693373. The next prime is 18693413. The reversal of 18693394 is 49339681.

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., 17098225 + 1595169 = 4135^2 + 1263^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18693394.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4673347 + ... + 4673350.

Almost surely, 2^18693394 is an apocalyptic number.

18693394 is a deficient number, since it is larger than the sum of its proper divisors (9346700).

18693394 is an equidigital number, since it uses as much as digits as its factorization.

18693394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346699.

The product of its digits is 139968, while the sum is 43.

The square root of 18693394 is about 4323.5857803448. The cubic root of 18693394 is about 265.3970268012.

The spelling of 18693394 in words is "eighteen million, six hundred ninety-three thousand, three hundred ninety-four".