18222494 has 4 divisors (see below), whose sum is σ = 27333744. Its totient is φ = 9111246.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222494 is 49422281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49422281 = 17 ⋅2907193.

It is a self number, because there is not a number n which added to its sum of digits gives 18222494.

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, 4555622 + ... + 4555625.

It is an arithmetic number, because the mean of its divisors is an integer number (6833436).

Almost surely, 2^18222494 is an apocalyptic number.

18222494 is a deficient number, since it is larger than the sum of its proper divisors (9111250).

18222494 is an equidigital number, since it uses as much as digits as its factorization.

18222494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9111249.

The product of its digits is 9216, while the sum is 32.

The square root of 18222494 is about 4268.7813249217. The cubic root of 18222494 is about 263.1495340123.

The spelling of 18222494 in words is "eighteen million, two hundred twenty-two thousand, four hundred ninety-four".