22640843 has 4 divisors (see below), whose sum is σ = 22738248. Its totient is φ = 22543440.

The previous prime is 22640831. The next prime is 22640857. The reversal of 22640843 is 34804622.

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 22640843 - 2⁸ = 22640587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22646843) 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, 48353 + ... + 48818.

It is an arithmetic number, because the mean of its divisors is an integer number (5684562).

Almost surely, 2^22640843 is an apocalyptic number.

22640843 is a deficient number, since it is larger than the sum of its proper divisors (97405).

22640843 is an equidigital number, since it uses as much as digits as its factorization.

22640843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97404.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 22640843 is about 4758.2394853559. The cubic root of 22640843 is about 282.8986430890.

The spelling of 22640843 in words is "twenty-two million, six hundred forty thousand, eight hundred forty-three".