421343028 has 72 divisors (see below), whose sum is σ = 1130455872. Its totient is φ = 131864832.

The previous prime is 421343023. The next prime is 421343033. The reversal of 421343028 is 820343124.

It is an interprime number because it is at equal distance from previous prime (421343023) and next prime (421343033).

It is a junction number, because it is equal to n+sod(n) for n = 421342992 and 421343010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421343023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444451 + ... + 445397.

It is an arithmetic number, because the mean of its divisors is an integer number (15700776).

Almost surely, 2^421343028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421343028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565227936).

421343028 is an abundant number, since it is smaller than the sum of its proper divisors (709112844).

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

421343028 is a wasteful number, since it uses less digits than its factorization.

421343028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 421343028 is about 20526.6419075308. The cubic root of 421343028 is about 749.6846247365.

The spelling of 421343028 in words is "four hundred twenty-one million, three hundred forty-three thousand, twenty-eight".