22387994 has 4 divisors (see below), whose sum is σ = 33581994. Its totient is φ = 11193996.

The previous prime is 22387991. The next prime is 22387999. The reversal of 22387994 is 49978322.

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., 20025625 + 2362369 = 4475^2 + 1537^2 .

It is not an unprimeable number, because it can be changed into a prime (22387991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5596997 + ... + 5597000.

Almost surely, 2^22387994 is an apocalyptic number.

22387994 is a deficient number, since it is larger than the sum of its proper divisors (11194000).

22387994 is a wasteful number, since it uses less digits than its factorization.

22387994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11193999.

The product of its digits is 217728, while the sum is 44.

The square root of 22387994 is about 4731.5952912311. The cubic root of 22387994 is about 281.8415772650.

The spelling of 22387994 in words is "twenty-two million, three hundred eighty-seven thousand, nine hundred ninety-four".