51387843 has 16 divisors (see below), whose sum is σ = 73928960. Its totient is φ = 31562784.

The previous prime is 51387811. The next prime is 51387851. The reversal of 51387843 is 34878315.

It is not a de Polignac number, because 51387843 - 2⁵ = 51387811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51387893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27930 + ... + 29712.

It is an arithmetic number, because the mean of its divisors is an integer number (4620560).

Almost surely, 2^51387843 is an apocalyptic number.

51387843 is a deficient number, since it is larger than the sum of its proper divisors (22541117).

51387843 is a wasteful number, since it uses less digits than its factorization.

51387843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538.

The product of its digits is 80640, while the sum is 39.

The square root of 51387843 is about 7168.5314395628. The cubic root of 51387843 is about 371.7806618314.

The spelling of 51387843 in words is "fifty-one million, three hundred eighty-seven thousand, eight hundred forty-three".