51383740 has 48 divisors (see below), whose sum is σ = 112250880. Its totient is φ = 19736640.

The previous prime is 51383711. The next prime is 51383747. The reversal of 51383740 is 4738315.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51383747) 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 15 ways as a sum of consecutive naturals, for example, 110749 + ... + 111211.

It is an arithmetic number, because the mean of its divisors is an integer number (2338560).

Almost surely, 2^51383740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51383740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56125440).

51383740 is an abundant number, since it is smaller than the sum of its proper divisors (60867140).

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

51383740 is a wasteful number, since it uses less digits than its factorization.

51383740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 51383740 is about 7168.2452525008. The cubic root of 51383740 is about 371.7707667761.

The spelling of 51383740 in words is "fifty-one million, three hundred eighty-three thousand, seven hundred forty".