18374864 has 30 divisors (see below), whose sum is σ = 37014930. Its totient is φ = 8826048.

The previous prime is 18374857. The next prime is 18374879. The reversal of 18374864 is 46847381.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 2534464 = 3980^2 + 1592^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92237 + ... + 92435.

It is an arithmetic number, because the mean of its divisors is an integer number (1233831).

Almost surely, 2^18374864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18374864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18507465).

18374864 is an abundant number, since it is smaller than the sum of its proper divisors (18640066).

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

18374864 is an equidigital number, since it uses as much as digits as its factorization.

18374864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 230 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 18374864 is about 4286.5911864791. The cubic root of 18374864 is about 263.8809533660.

The spelling of 18374864 in words is "eighteen million, three hundred seventy-four thousand, eight hundred sixty-four".