18319974 has 8 divisors (see below), whose sum is σ = 36639960. Its totient is φ = 6106656.

The previous prime is 18319969. The next prime is 18319979. The reversal of 18319974 is 47991381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18319969) and next prime (18319979).

It is a sphenic number, since it is the product of 3 distinct primes.

18319974 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319979) 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, 1526659 + ... + 1526670.

It is an arithmetic number, because the mean of its divisors is an integer number (4579995).

Almost surely, 2^18319974 is an apocalyptic number.

18319974 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18319974 is a wasteful number, since it uses less digits than its factorization.

18319974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053334.

The product of its digits is 54432, while the sum is 42.

The square root of 18319974 is about 4280.1838745549. The cubic root of 18319974 is about 263.6179333277.

The spelling of 18319974 in words is "eighteen million, three hundred nineteen thousand, nine hundred seventy-four".