22618993 has 4 divisors (see below), whose sum is σ = 23949540. Its totient is φ = 21288448.

The previous prime is 22618991. The next prime is 22619011. The reversal of 22618993 is 39981622.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39981622 = 2 ⋅19990811.

It can be written as a sum of positive squares in 2 ways, for example, as 12334144 + 10284849 = 3512^2 + 3207^2 .

It is a cyclic number.

It is not a de Polignac number, because 22618993 - 2¹ = 22618991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22618991) 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, 665248 + ... + 665281.

It is an arithmetic number, because the mean of its divisors is an integer number (5987385).

Almost surely, 2^22618993 is an apocalyptic number.

It is an amenable number.

22618993 is a deficient number, since it is larger than the sum of its proper divisors (1330547).

22618993 is a wasteful number, since it uses less digits than its factorization.

22618993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330546.

The product of its digits is 46656, while the sum is 40.

The square root of 22618993 is about 4755.9429138710. The cubic root of 22618993 is about 282.8076081264.

The spelling of 22618993 in words is "twenty-two million, six hundred eighteen thousand, nine hundred ninety-three".