22401638 has 16 divisors (see below), whose sum is σ = 38464800. Its totient is φ = 9585216.

The previous prime is 22401619. The next prime is 22401647. The reversal of 22401638 is 83610422.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 13688 + ... + 15236.

It is an arithmetic number, because the mean of its divisors is an integer number (2404050).

Almost surely, 2^22401638 is an apocalyptic number.

22401638 is a deficient number, since it is larger than the sum of its proper divisors (16063162).

22401638 is a wasteful number, since it uses less digits than its factorization.

22401638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 22401638 is about 4733.0368686500. The cubic root of 22401638 is about 281.8988202314.

The spelling of 22401638 in words is "twenty-two million, four hundred one thousand, six hundred thirty-eight".