22427287 has 4 divisors (see below), whose sum is σ = 22974336. Its totient is φ = 21880240.

The previous prime is 22427281. The next prime is 22427297. The reversal of 22427287 is 78272422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78272422 = 2 ⋅39136211.

It is a cyclic number.

It is not a de Polignac number, because 22427287 - 2¹¹ = 22425239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22427281) 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, 273463 + ... + 273544.

It is an arithmetic number, because the mean of its divisors is an integer number (5743584).

Almost surely, 2^22427287 is an apocalyptic number.

22427287 is a deficient number, since it is larger than the sum of its proper divisors (547049).

22427287 is an equidigital number, since it uses as much as digits as its factorization.

22427287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547048.

The product of its digits is 25088, while the sum is 34.

The square root of 22427287 is about 4735.7456646235. The cubic root of 22427287 is about 282.0063669069.

The spelling of 22427287 in words is "twenty-two million, four hundred twenty-seven thousand, two hundred eighty-seven".