22643473 has 4 divisors (see below), whose sum is σ = 23975460. Its totient is φ = 21311488.

The previous prime is 22643449. The next prime is 22643503. The reversal of 22643473 is 37434622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37434622 = 2 ⋅18717311.

It can be written as a sum of positive squares in 2 ways, for example, as 15737089 + 6906384 = 3967^2 + 2628^2 .

It is a cyclic number.

It is not a de Polignac number, because 22643473 - 2⁵ = 22643441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22647473) 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, 665968 + ... + 666001.

It is an arithmetic number, because the mean of its divisors is an integer number (5993865).

Almost surely, 2^22643473 is an apocalyptic number.

It is an amenable number.

22643473 is a deficient number, since it is larger than the sum of its proper divisors (1331987).

22643473 is a wasteful number, since it uses less digits than its factorization.

22643473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331986.

The product of its digits is 24192, while the sum is 31.

The square root of 22643473 is about 4758.5158400493. The cubic root of 22643473 is about 282.9095966656.

The spelling of 22643473 in words is "twenty-two million, six hundred forty-three thousand, four hundred seventy-three".