421978244 has 6 divisors (see below), whose sum is σ = 738461934. Its totient is φ = 210989120.

The previous prime is 421978243. The next prime is 421978259. The reversal of 421978244 is 442879124.

It can be written as a sum of positive squares in only one way, i.e., 419758144 + 2220100 = 20488^2 + 1490^2 .

It is not an unprimeable number, because it can be changed into a prime (421978241) by changing a digit.

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 as a sum of consecutive naturals, namely, 52747277 + ... + 52747284.

It is an arithmetic number, because the mean of its divisors is an integer number (123076989).

Almost surely, 2^421978244 is an apocalyptic number.

It is an amenable number.

421978244 is a deficient number, since it is larger than the sum of its proper divisors (316483690).

421978244 is a wasteful number, since it uses less digits than its factorization.

421978244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105494565 (or 105494563 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 421978244 is about 20542.1090445942. The cubic root of 421978244 is about 750.0611766394.

The spelling of 421978244 in words is "four hundred twenty-one million, nine hundred seventy-eight thousand, two hundred forty-four".