51942 has 16 divisors (see below), whose sum is σ = 113472. Its totient is φ = 15720.

The previous prime is 51941. The next prime is 51949. The reversal of 51942 is 24915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51941) 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, 328 + ... + 459.

It is an arithmetic number, because the mean of its divisors is an integer number (7092).

2⁵¹⁹⁴² is an apocalyptic number.

51942 is an abundant number, since it is smaller than the sum of its proper divisors (61530).

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 (56736).

51942 is a wasteful number, since it uses less digits than its factorization.

51942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

The product of its digits is 360, while the sum is 21.

The square root of 51942 is about 227.9078761254. The cubic root of 51942 is about 37.3112291204.

It can be divided in two parts, 519 and 42, that added together give a triangular number (561 = T₃₃).

The spelling of 51942 in words is "fifty-one thousand, nine hundred forty-two".