18147764 has 6 divisors (see below), whose sum is σ = 31758594. Its totient is φ = 9073880.

The previous prime is 18147757. The next prime is 18147769. The reversal of 18147764 is 46774181.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 85264 = 4250^2 + 292^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18147769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268467 + ... + 2268474.

It is an arithmetic number, because the mean of its divisors is an integer number (5293099).

Almost surely, 2^18147764 is an apocalyptic number.

It is an amenable number.

18147764 is a deficient number, since it is larger than the sum of its proper divisors (13610830).

18147764 is a wasteful number, since it uses less digits than its factorization.

18147764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536945 (or 4536943 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The square root of 18147764 is about 4260.0192487828. The cubic root of 18147764 is about 262.7893178931.

The spelling of 18147764 in words is "eighteen million, one hundred forty-seven thousand, seven hundred sixty-four".