51379818 has 16 divisors (see below), whose sum is σ = 117439680. Its totient is φ = 14679936.

The previous prime is 51379817. The next prime is 51379829. The reversal of 51379818 is 81897315.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1223329 = 51379818 / (5 + 1 + 3 + 7 + 9 + 8 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 51379818.

It is not an unprimeable number, because it can be changed into a prime (51379813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611623 + ... + 611706.

It is an arithmetic number, because the mean of its divisors is an integer number (7339980).

Almost surely, 2^51379818 is an apocalyptic number.

51379818 is an abundant number, since it is smaller than the sum of its proper divisors (66059862).

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

51379818 is a wasteful number, since it uses less digits than its factorization.

51379818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223341.

The product of its digits is 60480, while the sum is 42.

The square root of 51379818 is about 7167.9716796316. The cubic root of 51379818 is about 371.7613077394.

The spelling of 51379818 in words is "fifty-one million, three hundred seventy-nine thousand, eight hundred eighteen".