22991845 has 8 divisors (see below), whose sum is σ = 27663480. Its totient is φ = 18344640.

The previous prime is 22991833. The next prime is 22991849. The reversal of 22991845 is 54819922.

It can be written as a sum of positive squares in 4 ways, for example, as 9409 + 22982436 = 97^2 + 4794^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22991845 - 2⁹ = 22991333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22991798 and 22991807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22991849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3966 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (3457935).

Almost surely, 2^22991845 is an apocalyptic number.

It is an amenable number.

22991845 is a deficient number, since it is larger than the sum of its proper divisors (4671635).

22991845 is a wasteful number, since it uses less digits than its factorization.

22991845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12215.

The product of its digits is 51840, while the sum is 40.

The square root of 22991845 is about 4794.9812304116. The cubic root of 22991845 is about 284.3530828015.

The spelling of 22991845 in words is "twenty-two million, nine hundred ninety-one thousand, eight hundred forty-five".