22013978 has 8 divisors (see below), whose sum is σ = 37738272. Its totient is φ = 9434556.

The previous prime is 22013941. The next prime is 22013983. The reversal of 22013978 is 87931022.

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

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 3 ways as a sum of consecutive naturals, for example, 786200 + ... + 786227.

It is an arithmetic number, because the mean of its divisors is an integer number (4717284).

Almost surely, 2^22013978 is an apocalyptic number.

22013978 is a deficient number, since it is larger than the sum of its proper divisors (15724294).

22013978 is a wasteful number, since it uses less digits than its factorization.

22013978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572436.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 22013978 is about 4691.9055830227. The cubic root of 22013978 is about 280.2632642983.

It can be divided in two parts, 2201 and 3978, that multiplied together give a palindrome (8755578).

The spelling of 22013978 in words is "twenty-two million, thirteen thousand, nine hundred seventy-eight".