22287994 has 4 divisors (see below), whose sum is σ = 33431994. Its totient is φ = 11143996.

The previous prime is 22287983. The next prime is 22288001. The reversal of 22287994 is 49978222.

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

It can be written as a sum of positive squares in only one way, i.e., 22212369 + 75625 = 4713^2 + 275^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22287994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5571997 + ... + 5572000.

Almost surely, 2^22287994 is an apocalyptic number.

22287994 is a deficient number, since it is larger than the sum of its proper divisors (11144000).

22287994 is a wasteful number, since it uses less digits than its factorization.

22287994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11143999.

The product of its digits is 145152, while the sum is 43.

The square root of 22287994 is about 4721.0162041662. The cubic root of 22287994 is about 281.4213188984.

The spelling of 22287994 in words is "twenty-two million, two hundred eighty-seven thousand, nine hundred ninety-four".