220139978 has 16 divisors (see below), whose sum is σ = 335422080. Its totient is φ = 108341376.

The previous prime is 220139977. The next prime is 220140001. The reversal of 220139978 is 879931022.

It is a happy number.

220139978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (220139977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53801 + ... + 57747.

It is an arithmetic number, because the mean of its divisors is an integer number (20963880).

Almost surely, 2^220139978 is an apocalyptic number.

220139978 is a deficient number, since it is larger than the sum of its proper divisors (115282102).

220139978 is a wasteful number, since it uses less digits than its factorization.

220139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

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

The square root of 220139978 is about 14837.1148812699. The cubic root of 220139978 is about 603.8090799734.

The spelling of 220139978 in words is "two hundred twenty million, one hundred thirty-nine thousand, nine hundred seventy-eight".