222781986 has 48 divisors (see below), whose sum is σ = 556568064. Its totient is φ = 63084672.

The previous prime is 222781919. The next prime is 222781997. The reversal of 222781986 is 689187222.

It is a super-2 number, since 2×222781986² = 99263626572208392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6415 + ... + 22061.

It is an arithmetic number, because the mean of its divisors is an integer number (11595168).

Almost surely, 2^222781986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222781986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278284032).

222781986 is an abundant number, since it is smaller than the sum of its proper divisors (333786078).

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

222781986 is a wasteful number, since it uses less digits than its factorization.

222781986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15775 (or 15772 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 222781986 is about 14925.8830894524. The cubic root of 222781986 is about 606.2150169915.

The spelling of 222781986 in words is "two hundred twenty-two million, seven hundred eighty-one thousand, nine hundred eighty-six".