239428 has 24 divisors (see below), whose sum is σ = 508032. Its totient is φ = 96384.

The previous prime is 239423. The next prime is 239429. The reversal of 239428 is 824932.

239428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a d-powerful number, because it can be written as 2⁷ + 3³ + 4⁷ + 9⁵ + 2¹⁷ + 8⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 239396 and 239405.

It is not an unprimeable number, because it can be changed into a prime (239423) by changing a digit.

239428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2²³⁹⁴²⁸ is an apocalyptic number.

239428 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 239428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254016).

239428 is an abundant number, since it is smaller than the sum of its proper divisors (268604).

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

239428 is a wasteful number, since it uses less digits than its factorization.

239428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 529 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 239428 is about 489.3138052416. The cubic root of 239428 is about 62.0952403729.

The spelling of 239428 in words is "two hundred thirty-nine thousand, four hundred twenty-eight".