22158742 has 4 divisors (see below), whose sum is σ = 33238116. Its totient is φ = 11079370.

The previous prime is 22158739. The next prime is 22158749. The reversal of 22158742 is 24785122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22158749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5539684 + ... + 5539687.

It is an arithmetic number, because the mean of its divisors is an integer number (8309529).

Almost surely, 2^22158742 is an apocalyptic number.

22158742 is a deficient number, since it is larger than the sum of its proper divisors (11079374).

22158742 is a wasteful number, since it uses less digits than its factorization.

22158742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11079373.

The product of its digits is 8960, while the sum is 31.

The square root of 22158742 is about 4707.3072982332. The cubic root of 22158742 is about 280.8762599858.

The spelling of 22158742 in words is "twenty-two million, one hundred fifty-eight thousand, seven hundred forty-two".