18321974 has 16 divisors (see below), whose sum is σ = 30131136. Its totient is φ = 8286600.

The previous prime is 18321967. The next prime is 18321977. The reversal of 18321974 is 47912381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (1883196).

Almost surely, 2^18321974 is an apocalyptic number.

18321974 is a deficient number, since it is larger than the sum of its proper divisors (11809162).

18321974 is a wasteful number, since it uses less digits than its factorization.

18321974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171.

The product of its digits is 12096, while the sum is 35.

The square root of 18321974 is about 4280.4175030013. The cubic root of 18321974 is about 263.6275260757.

The spelling of 18321974 in words is "eighteen million, three hundred twenty-one thousand, nine hundred seventy-four".