18381037 has 12 divisors (see below), whose sum is σ = 19751040. Its totient is φ = 17098632.

The previous prime is 18381031. The next prime is 18381049. The reversal of 18381037 is 73018381.

It is a de Polignac number, because none of the positive numbers 2^k-18381037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381031) 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 11 ways as a sum of consecutive naturals, for example, 20868 + ... + 21730.

It is an arithmetic number, because the mean of its divisors is an integer number (1645920).

Almost surely, 2^18381037 is an apocalyptic number.

It is an amenable number.

18381037 is a deficient number, since it is larger than the sum of its proper divisors (1370003).

18381037 is an equidigital number, since it uses as much as digits as its factorization.

18381037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18381037 is about 4287.3111620222. The cubic root of 18381037 is about 263.9105001560.

The spelling of 18381037 in words is "eighteen million, three hundred eighty-one thousand, thirty-seven".