22400639 has 4 divisors (see below), whose sum is σ = 23579640. Its totient is φ = 21221640.

The previous prime is 22400627. The next prime is 22400647. The reversal of 22400639 is 93600422.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22400639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589472 + ... + 589509.

It is an arithmetic number, because the mean of its divisors is an integer number (5894910).

Almost surely, 2^22400639 is an apocalyptic number.

22400639 is a deficient number, since it is larger than the sum of its proper divisors (1179001).

22400639 is a wasteful number, since it uses less digits than its factorization.

22400639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179000.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 22400639 is about 4732.9313326944. The cubic root of 22400639 is about 281.8946297475.

The spelling of 22400639 in words is "twenty-two million, four hundred thousand, six hundred thirty-nine".