22428239 has 4 divisors (see below), whose sum is σ = 22558056. Its totient is φ = 22298424.

The previous prime is 22428233. The next prime is 22428257. The reversal of 22428239 is 93282422.

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

It is a cyclic number.

It is not a de Polignac number, because 22428239 - 2²⁰ = 21379663 is a prime.

It is a super-2 number, since 2×22428239² = 1006051809282242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22428233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64649 + ... + 64994.

It is an arithmetic number, because the mean of its divisors is an integer number (5639514).

Almost surely, 2^22428239 is an apocalyptic number.

22428239 is a deficient number, since it is larger than the sum of its proper divisors (129817).

22428239 is a wasteful number, since it uses less digits than its factorization.

22428239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129816.

The product of its digits is 13824, while the sum is 32.

The square root of 22428239 is about 4735.8461757114. The cubic root of 22428239 is about 282.0103570798.

The spelling of 22428239 in words is "twenty-two million, four hundred twenty-eight thousand, two hundred thirty-nine".