917222138 has 32 divisors (see below), whose sum is σ = 1590969600. Its totient is φ = 388468224.

The previous prime is 917222123. The next prime is 917222149. The reversal of 917222138 is 831222719.

It is a junction number, because it is equal to n+sod(n) for n = 917222098 and 917222107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986858 + ... + 987786.

It is an arithmetic number, because the mean of its divisors is an integer number (49717800).

Almost surely, 2^917222138 is an apocalyptic number.

917222138 is a deficient number, since it is larger than the sum of its proper divisors (673747462).

917222138 is a wasteful number, since it uses less digits than its factorization.

917222138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its digits is 12096, while the sum is 35.

The square root of 917222138 is about 30285.6754588700. The cubic root of 917222138 is about 971.6089561772.

The spelling of 917222138 in words is "nine hundred seventeen million, two hundred twenty-two thousand, one hundred thirty-eight".