22818493 has 2 divisors, whose sum is σ = 22818494. Its totient is φ = 22818492.

The previous prime is 22818479. The next prime is 22818503. The reversal of 22818493 is 39481822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13344409 + 9474084 = 3653^2 + 3078^2 .

It is a cyclic number.

It is not a de Polignac number, because 22818493 - 2¹⁷ = 22687421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22818473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11409246 + 11409247.

It is an arithmetic number, because the mean of its divisors is an integer number (11409247).

Almost surely, 2^22818493 is an apocalyptic number.

It is an amenable number.

22818493 is a deficient number, since it is larger than the sum of its proper divisors (1).

22818493 is an equidigital number, since it uses as much as digits as its factorization.

22818493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 22818493 is about 4776.8706283507. The cubic root of 22818493 is about 283.6366319224.

It can be divided in two parts, 228 and 18493, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 22818493 in words is "twenty-two million, eight hundred eighteen thousand, four hundred ninety-three".