18618694 has 4 divisors (see below), whose sum is σ = 27928044. Its totient is φ = 9309346.

The previous prime is 18618673. The next prime is 18618703. The reversal of 18618694 is 49681681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49681681 = 7 ⋅7097383.

It is a self number, because there is not a number n which added to its sum of digits gives 18618694.

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, 4654672 + ... + 4654675.

It is an arithmetic number, because the mean of its divisors is an integer number (6982011).

Almost surely, 2^18618694 is an apocalyptic number.

18618694 is a deficient number, since it is larger than the sum of its proper divisors (9309350).

18618694 is an equidigital number, since it uses as much as digits as its factorization.

18618694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309349.

The product of its digits is 82944, while the sum is 43.

The square root of 18618694 is about 4314.9384700132. The cubic root of 18618694 is about 265.0430403570.

The spelling of 18618694 in words is "eighteen million, six hundred eighteen thousand, six hundred ninety-four".