421304028 has 24 divisors (see below), whose sum is σ = 1007020560. Its totient is φ = 137009280.

The previous prime is 421304021. The next prime is 421304029. The reversal of 421304028 is 820403124.

It is a junction number, because it is equal to n+sod(n) for n = 421303989 and 421304007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421304021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427663 + ... + 428646.

It is an arithmetic number, because the mean of its divisors is an integer number (41959190).

Almost surely, 2^421304028 is an apocalyptic number.

It is an amenable number.

421304028 is an abundant number, since it is smaller than the sum of its proper divisors (585716532).

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

421304028 is a wasteful number, since it uses less digits than its factorization.

421304028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856357 (or 856355 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 421304028 is about 20525.6919006400. The cubic root of 421304028 is about 749.6614934630.

The spelling of 421304028 in words is "four hundred twenty-one million, three hundred four thousand, twenty-eight".