22402993 has 4 divisors (see below), whose sum is σ = 23175540. Its totient is φ = 21630448.

The previous prime is 22402979. The next prime is 22402999. The reversal of 22402993 is 39920422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39920422 = 2 ⋅19960211.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 13593969 = 2968^2 + 3687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22402993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22402999) 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, 386230 + ... + 386287.

It is an arithmetic number, because the mean of its divisors is an integer number (5793885).

Almost surely, 2^22402993 is an apocalyptic number.

It is an amenable number.

22402993 is a deficient number, since it is larger than the sum of its proper divisors (772547).

22402993 is an equidigital number, since it uses as much as digits as its factorization.

22402993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772546.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 22402993 is about 4733.1800092538. The cubic root of 22402993 is about 281.9045038217.

The spelling of 22402993 in words is "twenty-two million, four hundred two thousand, nine hundred ninety-three".