22639394 has 4 divisors (see below), whose sum is σ = 33959094. Its totient is φ = 11319696.

The previous prime is 22639361. The next prime is 22639399. The reversal of 22639394 is 49393622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49393622 = 2 ⋅24696811.

It can be written as a sum of positive squares in only one way, i.e., 17952169 + 4687225 = 4237^2 + 2165^2 .

It is not an unprimeable number, because it can be changed into a prime (22639399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5659847 + ... + 5659850.

Almost surely, 2^22639394 is an apocalyptic number.

22639394 is a deficient number, since it is larger than the sum of its proper divisors (11319700).

22639394 is a wasteful number, since it uses less digits than its factorization.

22639394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11319699.

The product of its digits is 69984, while the sum is 38.

The square root of 22639394 is about 4758.0872207222. The cubic root of 22639394 is about 282.8926078473.

The spelling of 22639394 in words is "twenty-two million, six hundred thirty-nine thousand, three hundred ninety-four".