18994349 has 4 divisors (see below), whose sum is σ = 20721120. Its totient is φ = 17267580.

The previous prime is 18994337. The next prime is 18994361. The reversal of 18994349 is 94349981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18994337) and next prime (18994361).

It is a de Polignac number, because none of the positive numbers 2^k-18994349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863369 + ... + 863390.

It is an arithmetic number, because the mean of its divisors is an integer number (5180280).

Almost surely, 2^18994349 is an apocalyptic number.

It is an amenable number.

18994349 is a deficient number, since it is larger than the sum of its proper divisors (1726771).

18994349 is a wasteful number, since it uses less digits than its factorization.

18994349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726770.

The product of its digits is 279936, while the sum is 47.

The square root of 18994349 is about 4358.2506811793. The cubic root of 18994349 is about 266.8137076215.

The spelling of 18994349 in words is "eighteen million, nine hundred ninety-four thousand, three hundred forty-nine".