51243738 has 64 divisors (see below), whose sum is σ = 127303680. Its totient is φ = 13390272.

The previous prime is 51243733. The next prime is 51243749. The reversal of 51243738 is 83734215.

It is a junction number, because it is equal to n+sod(n) for n = 51243699 and 51243708.

It is not an unprimeable number, because it can be changed into a prime (51243733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68973 + ... + 69711.

It is an arithmetic number, because the mean of its divisors is an integer number (1989120).

Almost surely, 2^51243738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51243738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63651840).

51243738 is an abundant number, since it is smaller than the sum of its proper divisors (76059942).

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

51243738 is a wasteful number, since it uses less digits than its factorization.

51243738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 20160, while the sum is 33.

The square root of 51243738 is about 7158.4731612265. The cubic root of 51243738 is about 371.4328129552.

The spelling of 51243738 in words is "fifty-one million, two hundred forty-three thousand, seven hundred thirty-eight".