518221340 has 48 divisors (see below), whose sum is σ = 1339407552. Its totient is φ = 164007936.

The previous prime is 518221339. The next prime is 518221381. The reversal of 518221340 is 43122815.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 140549 + ... + 144188.

It is an arithmetic number, because the mean of its divisors is an integer number (27904324).

Almost surely, 2^518221340 is an apocalyptic number.

It is an amenable number.

518221340 is an abundant number, since it is smaller than the sum of its proper divisors (821186212).

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

518221340 is a wasteful number, since it uses less digits than its factorization.

518221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284766 (or 284764 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 518221340 is about 22764.4753947900. The cubic root of 518221340 is about 803.2272448570.

The spelling of 518221340 in words is "five hundred eighteen million, two hundred twenty-one thousand, three hundred forty".