22528139 has 4 divisors (see below), whose sum is σ = 22587960. Its totient is φ = 22468320.

The previous prime is 22528123. The next prime is 22528169. The reversal of 22528139 is 93182522.

It is a happy number.

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 22528139 - 2⁴ = 22528123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22528169) 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, 29342 + ... + 30099.

It is an arithmetic number, because the mean of its divisors is an integer number (5646990).

Almost surely, 2^22528139 is an apocalyptic number.

22528139 is a deficient number, since it is larger than the sum of its proper divisors (59821).

22528139 is an equidigital number, since it uses as much as digits as its factorization.

22528139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59820.

The product of its digits is 8640, while the sum is 32.

The square root of 22528139 is about 4746.3816744969. The cubic root of 22528139 is about 282.4284476942.

The spelling of 22528139 in words is "twenty-two million, five hundred twenty-eight thousand, one hundred thirty-nine".