51438 has 8 divisors (see below), whose sum is σ = 102888. Its totient is φ = 17144.

The previous prime is 51437. The next prime is 51439. The reversal of 51438 is 83415.

It is an interprime number because it is at equal distance from previous prime (51437) and next prime (51439).

It is a sphenic number, since it is the product of 3 distinct primes.

51438 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51431) 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, 4281 + ... + 4292.

It is an arithmetic number, because the mean of its divisors is an integer number (12861).

2⁵¹⁴³⁸ is an apocalyptic number.

51438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51444).

51438 is a wasteful number, since it uses less digits than its factorization.

51438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8578.

The product of its digits is 480, while the sum is 21.

The square root of 51438 is about 226.7994708989. The cubic root of 51438 is about 37.1901581086.

It can be divided in two parts, 5143 and 8, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 51438 in words is "fifty-one thousand, four hundred thirty-eight".