51389823 has 8 divisors (see below), whose sum is σ = 68916528. Its totient is φ = 34061504.

The previous prime is 51389809. The next prime is 51389831. The reversal of 51389823 is 32898315.

51389823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51389823 - 2⁹ = 51389311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51389803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48990 + ... + 50027.

It is an arithmetic number, because the mean of its divisors is an integer number (8614566).

Almost surely, 2^51389823 is an apocalyptic number.

51389823 is a deficient number, since it is larger than the sum of its proper divisors (17526705).

51389823 is a wasteful number, since it uses less digits than its factorization.

51389823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99193.

The product of its digits is 51840, while the sum is 39.

The square root of 51389823 is about 7168.6695418327. The cubic root of 51389823 is about 371.7854367368.

The spelling of 51389823 in words is "fifty-one million, three hundred eighty-nine thousand, eight hundred twenty-three".