222221840 has 40 divisors (see below), whose sum is σ = 517371648. Its totient is φ = 88767360.

The previous prime is 222221833. The next prime is 222221849. The reversal of 222221840 is 48122222.

222221840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×222221840³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (222221849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77879 + ... + 80681.

Almost surely, 2^222221840 is an apocalyptic number.

222221840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222221840 is an abundant number, since it is smaller than the sum of its proper divisors (295149808).

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

222221840 is a wasteful number, since it uses less digits than its factorization.

222221840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807 (or 3801 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 222221840 is about 14907.1070298700. The cubic root of 222221840 is about 605.7065170052.

The spelling of 222221840 in words is "two hundred twenty-two million, two hundred twenty-one thousand, eight hundred forty".