538840 has 32 divisors (see below), whose sum is σ = 1278000. Its totient is φ = 203904.

The previous prime is 538829. The next prime is 538841. The reversal of 538840 is 48835.

It is a super-3 number, since 3×538840³ = 469354230933312000, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 538799 and 538808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 1114.

2⁵³⁸⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 538840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639000).

538840 is an abundant number, since it is smaller than the sum of its proper divisors (739160).

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

538840 is a wasteful number, since it uses less digits than its factorization.

538840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 538840 is about 734.0572184782. The cubic root of 538840 is about 81.3741769836.

It can be divided in two parts, 538 and 840, that added together give a triangular number (1378 = T₅₂).

The spelling of 538840 in words is "five hundred thirty-eight thousand, eight hundred forty".