22640042 has 8 divisors (see below), whose sum is σ = 34204800. Its totient is φ = 11238444.

The previous prime is 22639987. The next prime is 22640053. The reversal of 22640042 is 24004622.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 22639996 and 22640023.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40442 + ... + 40997.

It is an arithmetic number, because the mean of its divisors is an integer number (4275600).

Almost surely, 2^22640042 is an apocalyptic number.

22640042 is a deficient number, since it is larger than the sum of its proper divisors (11564758).

22640042 is a wasteful number, since it uses less digits than its factorization.

22640042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81580.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22640042 is about 4758.1553148253. The cubic root of 22640042 is about 282.8953068693.

Adding to 22640042 its reverse (24004622), we get a palindrome (46644664).

The spelling of 22640042 in words is "twenty-two million, six hundred forty thousand, forty-two".