1223642442 has 64 divisors (see below), whose sum is σ = 2704762368. Its totient is φ = 365976000.

The previous prime is 1223642423. The next prime is 1223642449. The reversal of 1223642442 is 2442463221.

1223642442 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1223642449) 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, 2654092 + ... + 2654552.

It is an arithmetic number, because the mean of its divisors is an integer number (42261912).

Almost surely, 2^1223642442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223642442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352381184).

1223642442 is an abundant number, since it is smaller than the sum of its proper divisors (1481119926).

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

1223642442 is a wasteful number, since it uses less digits than its factorization.

1223642442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915.

The product of its digits is 18432, while the sum is 30.

The square root of 1223642442 is about 34980.6009382343. The cubic root of 1223642442 is about 1069.5920773054.

The spelling of 1223642442 in words is "one billion, two hundred twenty-three million, six hundred forty-two thousand, four hundred forty-two".