18044237 has 2 divisors, whose sum is σ = 18044238. Its totient is φ = 18044236.

The previous prime is 18044233. The next prime is 18044249. The reversal of 18044237 is 73244081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 1552516 = 4061^2 + 1246^2 .

It is a cyclic number.

It is not a de Polignac number, because 18044237 - 2² = 18044233 is a prime.

It is a Chen prime.

It is equal to p_1153973 and since 18044237 and 1153973 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18044233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022118 + 9022119.

It is an arithmetic number, because the mean of its divisors is an integer number (9022119).

Almost surely, 2^18044237 is an apocalyptic number.

It is an amenable number.

18044237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18044237 is an equidigital number, since it uses as much as digits as its factorization.

18044237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 18044237 is about 4247.8508683804. The cubic root of 18044237 is about 262.2886558897.

It can be divided in two parts, 18044 and 237, that added together give a palindrome (18281).

The spelling of 18044237 in words is "eighteen million, forty-four thousand, two hundred thirty-seven".