18874894 has 4 divisors (see below), whose sum is σ = 28312344. Its totient is φ = 9437446.

The previous prime is 18874859. The next prime is 18874897. The reversal of 18874894 is 49847881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49847881 = 127 ⋅392503.

It is a super-2 number, since 2×18874894² = 712523247022472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4718722 + ... + 4718725.

It is an arithmetic number, because the mean of its divisors is an integer number (7078086).

Almost surely, 2^18874894 is an apocalyptic number.

18874894 is a deficient number, since it is larger than the sum of its proper divisors (9437450).

18874894 is an equidigital number, since it uses as much as digits as its factorization.

18874894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437449.

The product of its digits is 516096, while the sum is 49.

The square root of 18874894 is about 4344.5245999994. The cubic root of 18874894 is about 266.2532026623.

The spelling of 18874894 in words is "eighteen million, eight hundred seventy-four thousand, eight hundred ninety-four".