51838 has 4 divisors (see below), whose sum is σ = 77760. Its totient is φ = 25918.

The previous prime is 51829. The next prime is 51839. The reversal of 51838 is 83815.

51838 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83815 = 5 ⋅16763.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12958 + ... + 12961.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2⁵¹⁸³⁸ is an apocalyptic number.

51838 is a deficient number, since it is larger than the sum of its proper divisors (25922).

51838 is a wasteful number, since it uses less digits than its factorization.

51838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25921.

The product of its digits is 960, while the sum is 25.

The square root of 51838 is about 227.6795994375. The cubic root of 51838 is about 37.2863105541.

The spelling of 51838 in words is "fifty-one thousand, eight hundred thirty-eight".