51398 has 8 divisors (see below), whose sum is σ = 79680. Its totient is φ = 24840.

The previous prime is 51383. The next prime is 51407. The reversal of 51398 is 89315.

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

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51398.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 353 + ... + 476.

It is an arithmetic number, because the mean of its divisors is an integer number (9960).

51398 is a Friedman number, since it can be written as (5^9-1)/38, using all its digits and the basic arithmetic operations.

2⁵¹³⁹⁸ is an apocalyptic number.

51398 is a deficient number, since it is larger than the sum of its proper divisors (28282).

51398 is a wasteful number, since it uses less digits than its factorization.

51398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its digits is 1080, while the sum is 26.

The square root of 51398 is about 226.7112701213. The cubic root of 51398 is about 37.1805154832.

The spelling of 51398 in words is "fifty-one thousand, three hundred ninety-eight".