18222994 has 4 divisors (see below), whose sum is σ = 27334494. Its totient is φ = 9111496.

The previous prime is 18222979. The next prime is 18223003. The reversal of 18222994 is 49922281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49922281 = 6491 ⋅7691.

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 4995225 = 3637^2 + 2235^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4555747 + ... + 4555750.

Almost surely, 2^18222994 is an apocalyptic number.

18222994 is a deficient number, since it is larger than the sum of its proper divisors (9111500).

18222994 is an equidigital number, since it uses as much as digits as its factorization.

18222994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9111499.

The product of its digits is 20736, while the sum is 37.

The square root of 18222994 is about 4268.8398892439. The cubic root of 18222994 is about 263.1519408099.

The spelling of 18222994 in words is "eighteen million, two hundred twenty-two thousand, nine hundred ninety-four".