222918993 has 32 divisors (see below), whose sum is σ = 364654080. Its totient is φ = 133459920.

The previous prime is 222918991. The next prime is 222919031. The reversal of 222918993 is 399819222.

It is a happy number.

222918993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222918993 - 2¹ = 222918991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222918991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20130 + ... + 29172.

It is an arithmetic number, because the mean of its divisors is an integer number (11395440).

Almost surely, 2^222918993 is an apocalyptic number.

It is an amenable number.

222918993 is a deficient number, since it is larger than the sum of its proper divisors (141735087).

222918993 is a wasteful number, since it uses less digits than its factorization.

222918993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9146 (or 9140 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 222918993 is about 14930.4719617298. The cubic root of 222918993 is about 606.3392620472.

The spelling of 222918993 in words is "two hundred twenty-two million, nine hundred eighteen thousand, nine hundred ninety-three".