51839978 has 12 divisors (see below), whose sum is σ = 78388422. Its totient is φ = 25712160.

The previous prime is 51839971. The next prime is 51840007. The reversal of 51839978 is 87993815.

51839978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 46471489 + 5368489 = 6817^2 + 2317^2 .

It is not an unprimeable number, because it can be changed into a prime (51839971) 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 5 ways as a sum of consecutive naturals, for example, 36848 + ... + 38228.

Almost surely, 2^51839978 is an apocalyptic number.

51839978 is a deficient number, since it is larger than the sum of its proper divisors (26548444).

51839978 is a wasteful number, since it uses less digits than its factorization.

51839978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1520 counting only the distinct ones).

The product of its digits is 544320, while the sum is 50.

The square root of 51839978 is about 7199.9984722221. The cubic root of 51839978 is about 372.8678479682.

The spelling of 51839978 in words is "fifty-one million, eight hundred thirty-nine thousand, nine hundred seventy-eight".