22781894 has 4 divisors (see below), whose sum is σ = 34172844. Its totient is φ = 11390946.

The previous prime is 22781833. The next prime is 22781897. The reversal of 22781894 is 49818722.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22781897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5695472 + ... + 5695475.

It is an arithmetic number, because the mean of its divisors is an integer number (8543211).

Almost surely, 2^22781894 is an apocalyptic number.

22781894 is a deficient number, since it is larger than the sum of its proper divisors (11390950).

22781894 is a wasteful number, since it uses less digits than its factorization.

22781894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11390949.

The product of its digits is 64512, while the sum is 41.

The square root of 22781894 is about 4773.0382357572. The cubic root of 22781894 is about 283.4849074412.

The spelling of 22781894 in words is "twenty-two million, seven hundred eighty-one thousand, eight hundred ninety-four".