22306639 has 4 divisors (see below), whose sum is σ = 23026240. Its totient is φ = 21587040.

The previous prime is 22306631. The next prime is 22306649. The reversal of 22306639 is 93660322.

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 22306639 - 2³ = 22306631 is a prime.

It is a super-2 number, since 2×22306639² = 995172286952642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 719569 = 22306639 / (2 + 2 + 3 + 0 + 6 + 6 + 3 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22306639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22306631) 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, 359754 + ... + 359815.

It is an arithmetic number, because the mean of its divisors is an integer number (5756560).

Almost surely, 2^22306639 is an apocalyptic number.

22306639 is a deficient number, since it is larger than the sum of its proper divisors (719601).

22306639 is an equidigital number, since it uses as much as digits as its factorization.

22306639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719600.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 22306639 is about 4722.9904721479. The cubic root of 22306639 is about 281.4997712708.

The spelling of 22306639 in words is "twenty-two million, three hundred six thousand, six hundred thirty-nine".