222138839 has 24 divisors (see below), whose sum is σ = 251222400. Its totient is φ = 196110720.

The previous prime is 222138803. The next prime is 222138857. The reversal of 222138839 is 938831222.

It is not a de Polignac number, because 222138839 - 2¹² = 222134743 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222138859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 570857 + ... + 571245.

It is an arithmetic number, because the mean of its divisors is an integer number (10467600).

Almost surely, 2^222138839 is an apocalyptic number.

222138839 is a deficient number, since it is larger than the sum of its proper divisors (29083561).

222138839 is a wasteful number, since it uses less digits than its factorization.

222138839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 542 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 222138839 is about 14904.3228293002. The cubic root of 222138839 is about 605.6310961148.

The spelling of 222138839 in words is "two hundred twenty-two million, one hundred thirty-eight thousand, eight hundred thirty-nine".