22540393 has 4 divisors (see below), whose sum is σ = 22812048. Its totient is φ = 22268740.

The previous prime is 22540387. The next prime is 22540409. The reversal of 22540393 is 39304522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39304522 = 2 ⋅19652261.

It is a cyclic number.

It is not a de Polignac number, because 22540393 - 2⁵ = 22540361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22540373) 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, 135703 + ... + 135868.

It is an arithmetic number, because the mean of its divisors is an integer number (5703012).

Almost surely, 2^22540393 is an apocalyptic number.

It is an amenable number.

22540393 is a deficient number, since it is larger than the sum of its proper divisors (271655).

22540393 is an equidigital number, since it uses as much as digits as its factorization.

22540393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271654.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 22540393 is about 4747.6723770707. The cubic root of 22540393 is about 282.4796466397.

The spelling of 22540393 in words is "twenty-two million, five hundred forty thousand, three hundred ninety-three".