51740 has 24 divisors (see below), whose sum is σ = 117600. Its totient is φ = 19008.

The previous prime is 51721. The next prime is 51749. The reversal of 51740 is 4715.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 359.

It is an arithmetic number, because the mean of its divisors is an integer number (4900).

2⁵¹⁷⁴⁰ 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 51740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58800).

51740 is an abundant number, since it is smaller than the sum of its proper divisors (65860).

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

51740 is a wasteful number, since it uses less digits than its factorization.

51740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 51740 is about 227.4642829105. The cubic root of 51740 is about 37.2627990791.

The spelling of 51740 in words is "fifty-one thousand, seven hundred forty".