22228739 has 12 divisors (see below), whose sum is σ = 24322896. Its totient is φ = 20303712.

The previous prime is 22228709. The next prime is 22228747. The reversal of 22228739 is 93782222.

It is a happy number.

It is not a de Polignac number, because 22228739 - 2²⁰ = 21180163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22228699 and 22228708.

It is not an unprimeable number, because it can be changed into a prime (22228709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16769 + ... + 18045.

It is an arithmetic number, because the mean of its divisors is an integer number (2026908).

Almost surely, 2^22228739 is an apocalyptic number.

22228739 is a deficient number, since it is larger than the sum of its proper divisors (2094157).

22228739 is a wasteful number, since it uses less digits than its factorization.

22228739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1393 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 22228739 is about 4714.7363659064. The cubic root of 22228739 is about 281.1717013975.

The spelling of 22228739 in words is "twenty-two million, two hundred twenty-eight thousand, seven hundred thirty-nine".