51387 has 8 divisors (see below), whose sum is σ = 78336. Its totient is φ = 29352.

The previous prime is 51383. The next prime is 51407. The reversal of 51387 is 78315.

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

It is not a de Polignac number, because 51387 - 2² = 51383 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 1203 + ... + 1244.

It is an arithmetic number, because the mean of its divisors is an integer number (9792).

2⁵¹³⁸⁷ is an apocalyptic number.

51387 is a deficient number, since it is larger than the sum of its proper divisors (26949).

51387 is a wasteful number, since it uses less digits than its factorization.

51387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457.

The product of its digits is 840, while the sum is 24.

The square root of 51387 is about 226.6870088911. The cubic root of 51387 is about 37.1778628842.

The spelling of 51387 in words is "fifty-one thousand, three hundred eighty-seven".