51987838 has 16 divisors (see below), whose sum is σ = 93813120. Its totient is φ = 21107736.

The previous prime is 51987821. The next prime is 51987847. The reversal of 51987838 is 83878915.

It is a junction number, because it is equal to n+sod(n) for n = 51987791 and 51987800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97456 + ... + 97987.

It is an arithmetic number, because the mean of its divisors is an integer number (5863320).

Almost surely, 2^51987838 is an apocalyptic number.

51987838 is a deficient number, since it is larger than the sum of its proper divisors (41825282).

51987838 is a wasteful number, since it uses less digits than its factorization.

51987838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195471.

The product of its digits is 483840, while the sum is 49.

The square root of 51987838 is about 7210.2592186412. The cubic root of 51987838 is about 373.2220141816. Note that the first 3 decimals are identical.

It can be divided in two parts, 51987 and 838, that added together give a palindrome (52825).

The spelling of 51987838 in words is "fifty-one million, nine hundred eighty-seven thousand, eight hundred thirty-eight".