18003764 has 12 divisors (see below), whose sum is σ = 31689924. Its totient is φ = 8949504.

The previous prime is 18003763. The next prime is 18003787. The reversal of 18003764 is 46730081.

It can be written as a sum of positive squares in 2 ways, for example, as 15147664 + 2856100 = 3892^2 + 1690^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18003763) 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, 12317 + ... + 13700.

It is an arithmetic number, because the mean of its divisors is an integer number (2640827).

Almost surely, 2^18003764 is an apocalyptic number.

It is an amenable number.

18003764 is a deficient number, since it is larger than the sum of its proper divisors (13686160).

18003764 is a wasteful number, since it uses less digits than its factorization.

18003764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26194 (or 26192 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 18003764 is about 4243.0842555858. The cubic root of 18003764 is about 262.0924056859.

The spelling of 18003764 in words is "eighteen million, three thousand, seven hundred sixty-four".