51143740 has 24 divisors (see below), whose sum is σ = 107618112. Its totient is φ = 20416320.

The previous prime is 51143717. The next prime is 51143759. The reversal of 51143740 is 4734115.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8845 + ... + 13435.

It is an arithmetic number, because the mean of its divisors is an integer number (4484088).

Almost surely, 2^51143740 is an apocalyptic number.

It is an amenable number.

51143740 is an abundant number, since it is smaller than the sum of its proper divisors (56474372).

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

51143740 is a wasteful number, since it uses less digits than its factorization.

51143740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5157 (or 5155 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 51143740 is about 7151.4851604405. The cubic root of 51143740 is about 371.1910486192.

Adding to 51143740 its reverse (4734115), we get a palindrome (55877855).

The spelling of 51143740 in words is "fifty-one million, one hundred forty-three thousand, seven hundred forty".