18944137 has 4 divisors (see below), whose sum is σ = 20058516. Its totient is φ = 17829760.

The previous prime is 18944129. The next prime is 18944141. The reversal of 18944137 is 73144981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15832441 + 3111696 = 3979^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 18944137 - 2³ = 18944129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18944096 and 18944105.

It is not an unprimeable number, because it can be changed into a prime (18944117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557164 + ... + 557197.

It is an arithmetic number, because the mean of its divisors is an integer number (5014629).

Almost surely, 2^18944137 is an apocalyptic number.

18944137 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18944137 is a deficient number, since it is larger than the sum of its proper divisors (1114379).

18944137 is a wasteful number, since it uses less digits than its factorization.

18944137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114378.

The product of its digits is 24192, while the sum is 37.

The square root of 18944137 is about 4352.4863009549. The cubic root of 18944137 is about 266.5783907461.

The spelling of 18944137 in words is "eighteen million, nine hundred forty-four thousand, one hundred thirty-seven".