809428 has 6 divisors (see below), whose sum is σ = 1416506. Its totient is φ = 404712.

The previous prime is 809423. The next prime is 809437. The reversal of 809428 is 824908.

809428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 213444 = 772^2 + 462^2 .

It is an Ulam number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 809428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101175 + ... + 101182.

2⁸⁰⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

809428 is a deficient number, since it is larger than the sum of its proper divisors (607078).

809428 is a wasteful number, since it uses less digits than its factorization.

809428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202361 (or 202359 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 809428 is about 899.6821661009. The cubic root of 809428 is about 93.1950275795.

The spelling of 809428 in words is "eight hundred nine thousand, four hundred twenty-eight".