18219037 has 2 divisors, whose sum is σ = 18219038. Its totient is φ = 18219036.

The previous prime is 18219017. The next prime is 18219077. The reversal of 18219037 is 73091281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10896601 + 7322436 = 3301^2 + 2706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18219037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18219017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109518 + 9109519.

It is an arithmetic number, because the mean of its divisors is an integer number (9109519).

Almost surely, 2^18219037 is an apocalyptic number.

It is an amenable number.

18219037 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219037 is an equidigital number, since it uses as much as digits as its factorization.

18219037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 18219037 is about 4268.3763892141. The cubic root of 18219037 is about 263.1328922092.

The spelling of 18219037 in words is "eighteen million, two hundred nineteen thousand, thirty-seven".