421879828 has 12 divisors (see below), whose sum is σ = 745600212. Its totient is φ = 208851200.

The previous prime is 421879807. The next prime is 421879877. The reversal of 421879828 is 828978124.

It can be written as a sum of positive squares in 2 ways, for example, as 338486404 + 83393424 = 18398^2 + 9132^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521725 + ... + 522532.

It is an arithmetic number, because the mean of its divisors is an integer number (62133351).

Almost surely, 2^421879828 is an apocalyptic number.

It is an amenable number.

421879828 is a deficient number, since it is larger than the sum of its proper divisors (323720384).

421879828 is a wasteful number, since it uses less digits than its factorization.

421879828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044362 (or 1044360 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 421879828 is about 20539.7134351967. The cubic root of 421879828 is about 750.0028610261.

The spelling of 421879828 in words is "four hundred twenty-one million, eight hundred seventy-nine thousand, eight hundred twenty-eight".