222428639 has 2 divisors, whose sum is σ = 222428640. Its totient is φ = 222428638.

The previous prime is 222428621. The next prime is 222428683. The reversal of 222428639 is 936824222.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222428639 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 (222428039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111214319 + 111214320.

It is an arithmetic number, because the mean of its divisors is an integer number (111214320).

Almost surely, 2^222428639 is an apocalyptic number.

222428639 is a deficient number, since it is larger than the sum of its proper divisors (1).

222428639 is an equidigital number, since it uses as much as digits as its factorization.

222428639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 38.

The square root of 222428639 is about 14914.0416721960. The cubic root of 222428639 is about 605.8943483284.

The spelling of 222428639 in words is "two hundred twenty-two million, four hundred twenty-eight thousand, six hundred thirty-nine".