51405718 has 48 divisors (see below), whose sum is σ = 98402976. Its totient is φ = 19601280.

The previous prime is 51405709. The next prime is 51405721. The reversal of 51405718 is 81750415.

It is a self number, because there is not a number n which added to its sum of digits gives 51405718.

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 23 ways as a sum of consecutive naturals, for example, 619305 + ... + 619387.

It is an arithmetic number, because the mean of its divisors is an integer number (2050062).

Almost surely, 2^51405718 is an apocalyptic number.

51405718 is a deficient number, since it is larger than the sum of its proper divisors (46997258).

51405718 is a wasteful number, since it uses less digits than its factorization.

51405718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 51405718 is about 7169.7780997741. The cubic root of 51405718 is about 371.8237641720.

It can be divided in two parts, 51 and 405718, that added together give a square (405769 = 637²).

The spelling of 51405718 in words is "fifty-one million, four hundred five thousand, seven hundred eighteen".