18038736 has 30 divisors (see below), whose sum is σ = 50483810. Its totient is φ = 6012864.

The previous prime is 18038731. The next prime is 18038743. The reversal of 18038736 is 63783081.

It can be written as a sum of positive squares in only one way, i.e., 16451136 + 1587600 = 4056^2 + 1260^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18038736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62491 + ... + 62778.

Almost surely, 2^18038736 is an apocalyptic number.

18038736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18038736 is an abundant number, since it is smaller than the sum of its proper divisors (32445074).

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

18038736 is a wasteful number, since it uses less digits than its factorization.

18038736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125283 (or 125274 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 18038736 is about 4247.2033151240. The cubic root of 18038736 is about 262.2619992432.

The spelling of 18038736 in words is "eighteen million, thirty-eight thousand, seven hundred thirty-six".