928309 has 4 divisors (see below), whose sum is σ = 930240. Its totient is φ = 926380.

The previous prime is 928307. The next prime is 928313. The reversal of 928309 is 903829.

It is a happy number.

928309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903829 = 107 ⋅8447.

It is a cyclic number.

It is not a de Polignac number, because 928309 - 2¹ = 928307 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (928307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (232560).

2⁹²⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

928309 is a deficient number, since it is larger than the sum of its proper divisors (1931).

928309 is a wasteful number, since it uses less digits than its factorization.

928309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 928309 is about 963.4879345378. The cubic root of 928309 is about 97.5508041169.

The spelling of 928309 in words is "nine hundred twenty-eight thousand, three hundred nine".