22981945 has 16 divisors (see below), whose sum is σ = 32889600. Its totient is φ = 15073344.

The previous prime is 22981939. The next prime is 22981957. The reversal of 22981945 is 54918922.

It is a cyclic number.

It is not a de Polignac number, because 22981945 - 2¹⁵ = 22949177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22981898 and 22981907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13470 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (2055600).

Almost surely, 2^22981945 is an apocalyptic number.

It is an amenable number.

22981945 is a deficient number, since it is larger than the sum of its proper divisors (9907655).

22981945 is a wasteful number, since it uses less digits than its factorization.

22981945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28584.

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

The square root of 22981945 is about 4793.9487898808. The cubic root of 22981945 is about 284.3122639856.

The spelling of 22981945 in words is "twenty-two million, nine hundred eighty-one thousand, nine hundred forty-five".