22139978 has 16 divisors (see below), whose sum is σ = 39952320. Its totient is φ = 8989056.

The previous prime is 22139911. The next prime is 22139981. The reversal of 22139978 is 87993122.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41351 + ... + 41882.

It is an arithmetic number, because the mean of its divisors is an integer number (2497020).

Almost surely, 2^22139978 is an apocalyptic number.

22139978 is a deficient number, since it is larger than the sum of its proper divisors (17812342).

22139978 is a wasteful number, since it uses less digits than its factorization.

22139978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83261.

The product of its digits is 54432, while the sum is 41.

The square root of 22139978 is about 4705.3138046256. The cubic root of 22139978 is about 280.7969556871.

The spelling of 22139978 in words is "twenty-two million, one hundred thirty-nine thousand, nine hundred seventy-eight".