51386 has 4 divisors (see below), whose sum is σ = 77082. Its totient is φ = 25692.

The previous prime is 51383. The next prime is 51407. The reversal of 51386 is 68315.

51386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 17161 = 185^2 + 131^2 .

It is not an unprimeable number, because it can be changed into a prime (51383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845 + ... + 12848.

2⁵¹³⁸⁶ is an apocalyptic number.

51386 is a deficient number, since it is larger than the sum of its proper divisors (25696).

51386 is a wasteful number, since it uses less digits than its factorization.

51386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25695.

The product of its digits is 720, while the sum is 23.

The square root of 51386 is about 226.6848031960. The cubic root of 51386 is about 37.1776217201.

The spelling of 51386 in words is "fifty-one thousand, three hundred eighty-six".