838428 has 24 divisors (see below), whose sum is σ = 1977360. Its totient is φ = 276480.

The previous prime is 838421. The next prime is 838429. The reversal of 838428 is 824838.

838428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×838428² = 1405923022368, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 838428.

It is not an unprimeable number, because it can be changed into a prime (838421) by changing a digit.

838428 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, 988 + ... + 1628.

It is an arithmetic number, because the mean of its divisors is an integer number (82390).

2⁸³⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

838428 is an abundant number, since it is smaller than the sum of its proper divisors (1138932).

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

838428 is a wasteful number, since it uses less digits than its factorization.

838428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 755 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 838428 is about 915.6571410741. The cubic root of 838428 is about 94.2949840027.

The spelling of 838428 in words is "eight hundred thirty-eight thousand, four hundred twenty-eight".