421239478 has 24 divisors (see below), whose sum is σ = 699009696. Its totient is φ = 190235760.

The previous prime is 421239461. The next prime is 421239491. The reversal of 421239478 is 874932124.

It is a self number, because there is not a number n which added to its sum of digits gives 421239478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32451 + ... + 43537.

It is an arithmetic number, because the mean of its divisors is an integer number (29125404).

Almost surely, 2^421239478 is an apocalyptic number.

421239478 is a deficient number, since it is larger than the sum of its proper divisors (277770218).

421239478 is a wasteful number, since it uses less digits than its factorization.

421239478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11268 (or 11257 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 421239478 is about 20524.1194208180. The cubic root of 421239478 is about 749.6232051029.

The spelling of 421239478 in words is "four hundred twenty-one million, two hundred thirty-nine thousand, four hundred seventy-eight".