222978390 has 64 divisors (see below), whose sum is σ = 556839360. Its totient is φ = 57075200.

The previous prime is 222978389. The next prime is 222978401. The reversal of 222978390 is 93879222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170740 + ... + 172040.

It is an arithmetic number, because the mean of its divisors is an integer number (8700615).

Almost surely, 2^222978390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222978390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278419680).

222978390 is an abundant number, since it is smaller than the sum of its proper divisors (333860970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222978390 is a wasteful number, since it uses less digits than its factorization.

222978390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 222978390 is about 14932.4609492207. The cubic root of 222978390 is about 606.3931105093.

The spelling of 222978390 in words is "two hundred twenty-two million, nine hundred seventy-eight thousand, three hundred ninety".