18994958 has 4 divisors (see below), whose sum is σ = 28492440. Its totient is φ = 9497478.

The previous prime is 18994907. The next prime is 18994979. The reversal of 18994958 is 85949981.

It is a semiprime because it is the product of two primes.

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, 4748738 + ... + 4748741.

It is an arithmetic number, because the mean of its divisors is an integer number (7123110).

Almost surely, 2^18994958 is an apocalyptic number.

18994958 is a deficient number, since it is larger than the sum of its proper divisors (9497482).

18994958 is an equidigital number, since it uses as much as digits as its factorization.

18994958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9497481.

The product of its digits is 933120, while the sum is 53.

The square root of 18994958 is about 4358.3205481011. The cubic root of 18994958 is about 266.8165591329.

The spelling of 18994958 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred fifty-eight".