18454994 has 4 divisors (see below), whose sum is σ = 27682494. Its totient is φ = 9227496.

The previous prime is 18454987. The next prime is 18454999. The reversal of 18454994 is 49945481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49945481 = 2971 ⋅16811.

It can be written as a sum of positive squares in only one way, i.e., 9840769 + 8614225 = 3137^2 + 2935^2 .

It is not an unprimeable number, because it can be changed into a prime (18454999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4613747 + ... + 4613750.

Almost surely, 2^18454994 is an apocalyptic number.

18454994 is a deficient number, since it is larger than the sum of its proper divisors (9227500).

18454994 is an equidigital number, since it uses as much as digits as its factorization.

18454994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9227499.

The product of its digits is 207360, while the sum is 44.

The square root of 18454994 is about 4295.9276064664. The cubic root of 18454994 is about 264.2639787614.

The spelling of 18454994 in words is "eighteen million, four hundred fifty-four thousand, nine hundred ninety-four".