51939750 has 64 divisors (see below), whose sum is σ = 135323136. Its totient is φ = 13244000.

The previous prime is 51939739. The next prime is 51939751. The reversal of 51939750 is 5793915.

It is a junction number, because it is equal to n+sod(n) for n = 51939699 and 51939708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51939751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15745 + ... + 18755.

It is an arithmetic number, because the mean of its divisors is an integer number (2114424).

Almost surely, 2^51939750 is an apocalyptic number.

51939750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51939750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67661568).

51939750 is an abundant number, since it is smaller than the sum of its proper divisors (83383386).

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

51939750 is a wasteful number, since it uses less digits than its factorization.

51939750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 51939750 is about 7206.9237542796. The cubic root of 51939750 is about 373.1069036899.

The spelling of 51939750 in words is "fifty-one million, nine hundred thirty-nine thousand, seven hundred fifty".