31422222 has 64 divisors (see below), whose sum is σ = 79652160. Its totient is φ = 9096192.

The previous prime is 31422203. The next prime is 31422227. The reversal of 31422222 is 22222413.

It is a Harshad number since it is a multiple of its sum of digits (18).

31422222 is a modest number, since divided by 22222 gives 314 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 31422195 and 31422204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31422227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10618 + ... + 13250.

It is an arithmetic number, because the mean of its divisors is an integer number (1244565).

Almost surely, 2^31422222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31422222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39826080).

31422222 is an abundant number, since it is smaller than the sum of its proper divisors (48229938).

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

31422222 is a wasteful number, since it uses less digits than its factorization.

31422222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674 (or 2668 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 31422222 is about 5605.5527827325. The cubic root of 31422222 is about 315.5578324150.

Adding to 31422222 its reverse (22222413), we get a palindrome (53644635).

The spelling of 31422222 in words is "thirty-one million, four hundred twenty-two thousand, two hundred twenty-two".