51387842 has 32 divisors (see below), whose sum is σ = 89921664. Its totient is φ = 21788800.

The previous prime is 51387811. The next prime is 51387851. The reversal of 51387842 is 24878315.

It is a junction number, because it is equal to n+sod(n) for n = 51387796 and 51387805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19508 + ... + 21984.

It is an arithmetic number, because the mean of its divisors is an integer number (2810052).

Almost surely, 2^51387842 is an apocalyptic number.

51387842 is a deficient number, since it is larger than the sum of its proper divisors (38533822).

51387842 is a wasteful number, since it uses less digits than its factorization.

51387842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554.

The product of its digits is 53760, while the sum is 38.

The square root of 51387842 is about 7168.5313698135. The cubic root of 51387842 is about 371.7806594198.

The spelling of 51387842 in words is "fifty-one million, three hundred eighty-seven thousand, eight hundred forty-two".