22004993 has 4 divisors (see below), whose sum is σ = 22024020. Its totient is φ = 21985968.

The previous prime is 22004989. The next prime is 22005013. The reversal of 22004993 is 39940022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39940022 = 2 ⋅19970011.

It can be written as a sum of positive squares in 2 ways, for example, as 19642624 + 2362369 = 4432^2 + 1537^2 .

It is a cyclic number.

It is not a de Polignac number, because 22004993 - 2² = 22004989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22004903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7658 + ... + 10131.

It is an arithmetic number, because the mean of its divisors is an integer number (5506005).

Almost surely, 2^22004993 is an apocalyptic number.

It is an amenable number.

22004993 is a deficient number, since it is larger than the sum of its proper divisors (19027).

22004993 is a wasteful number, since it uses less digits than its factorization.

22004993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19026.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 22004993 is about 4690.9479852158. The cubic root of 22004993 is about 280.2251293142.

The spelling of 22004993 in words is "twenty-two million, four thousand, nine hundred ninety-three".