203421428 has 48 divisors (see below), whose sum is σ = 422620800. Its totient is φ = 83825280.

The previous prime is 203421401. The next prime is 203421431. The reversal of 203421428 is 824124302.

It is a junction number, because it is equal to n+sod(n) for n = 203421397 and 203421406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307418 + ... + 308078.

It is an arithmetic number, because the mean of its divisors is an integer number (8804600).

Almost surely, 2^203421428 is an apocalyptic number.

203421428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203421428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211310400).

203421428 is an abundant number, since it is smaller than the sum of its proper divisors (219199372).

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

203421428 is a wasteful number, since it uses less digits than its factorization.

203421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 203421428 is about 14262.5884046340. The cubic root of 203421428 is about 588.1194822522.

The spelling of 203421428 in words is "two hundred three million, four hundred twenty-one thousand, four hundred twenty-eight".