22540381 has 4 divisors (see below), whose sum is σ = 22550112. Its totient is φ = 22530652.

The previous prime is 22540373. The next prime is 22540387. The reversal of 22540381 is 18304522.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22540381 - 2³ = 22540373 is a prime.

It is a super-2 number, since 2×22540381² = 1016137551250322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22540387) 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, 840 + ... + 6766.

It is an arithmetic number, because the mean of its divisors is an integer number (5637528).

Almost surely, 2^22540381 is an apocalyptic number.

It is an amenable number.

22540381 is a deficient number, since it is larger than the sum of its proper divisors (9731).

22540381 is an equidigital number, since it uses as much as digits as its factorization.

22540381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9730.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 22540381 is about 4747.6711132933. The cubic root of 22540381 is about 282.4795965111.

The spelling of 22540381 in words is "twenty-two million, five hundred forty thousand, three hundred eighty-one".