4221978 has 8 divisors (see below), whose sum is σ = 8443968. Its totient is φ = 1407324.

The previous prime is 4221977. The next prime is 4221989. The reversal of 4221978 is 8791224.

It is a happy number.

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

4221978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (4221977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351826 + ... + 351837.

It is an arithmetic number, because the mean of its divisors is an integer number (1055496).

Almost surely, 2^4221978 is an apocalyptic number.

4221978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221978 is a wasteful number, since it uses less digits than its factorization.

4221978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703668.

The product of its digits is 8064, while the sum is 33.

The square root of 4221978 is about 2054.7452396830. The cubic root of 4221978 is about 161.6238031875.

The spelling of 4221978 in words is "four million, two hundred twenty-one thousand, nine hundred seventy-eight".