18222437 has 2 divisors, whose sum is σ = 18222438. Its totient is φ = 18222436.

The previous prime is 18222433. The next prime is 18222443. The reversal of 18222437 is 73422281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16370116 + 1852321 = 4046^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 18222437 - 2² = 18222433 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18222431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111218 + 9111219.

It is an arithmetic number, because the mean of its divisors is an integer number (9111219).

Almost surely, 2^18222437 is an apocalyptic number.

It is an amenable number.

18222437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222437 is an equidigital number, since it uses as much as digits as its factorization.

18222437 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18222437 is about 4268.7746485379. The cubic root of 18222437 is about 263.1492596346.

The spelling of 18222437 in words is "eighteen million, two hundred twenty-two thousand, four hundred thirty-seven".