23115222 has 48 divisors (see below), whose sum is σ = 54342288. Its totient is φ = 7058880.

The previous prime is 23115221. The next prime is 23115227. The reversal of 23115222 is 22251132.

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

It is a junction number, because it is equal to n+sod(n) for n = 23115195 and 23115204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23115221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40197 + ... + 40767.

It is an arithmetic number, because the mean of its divisors is an integer number (1132131).

Almost surely, 2^23115222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23115222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27171144).

23115222 is an abundant number, since it is smaller than the sum of its proper divisors (31227066).

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

23115222 is a wasteful number, since it uses less digits than its factorization.

23115222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 762 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 23115222 is about 4807.8292398961. The cubic root of 23115222 is about 284.8607999822.

Adding to 23115222 its reverse (22251132), we get a palindrome (45366354).

The spelling of 23115222 in words is "twenty-three million, one hundred fifteen thousand, two hundred twenty-two".