51247842 has 8 divisors (see below), whose sum is σ = 102495696. Its totient is φ = 17082612.

The previous prime is 51247837. The next prime is 51247919. The reversal of 51247842 is 24874215.

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

51247842 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270648 + ... + 4270659.

It is an arithmetic number, because the mean of its divisors is an integer number (12811962).

Almost surely, 2^51247842 is an apocalyptic number.

51247842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51247842 is a wasteful number, since it uses less digits than its factorization.

51247842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8541312.

The product of its digits is 17920, while the sum is 33.

The square root of 51247842 is about 7158.7598087937. The cubic root of 51247842 is about 371.4427284404.

The spelling of 51247842 in words is "fifty-one million, two hundred forty-seven thousand, eight hundred forty-two".