518138387 has 8 divisors (see below), whose sum is σ = 569868096. Its totient is φ = 468104832.

The previous prime is 518138381. The next prime is 518138399. The reversal of 518138387 is 783831815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 518138387 - 2¹⁰ = 518137363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518138381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423398 + ... + 424619.

It is an arithmetic number, because the mean of its divisors is an integer number (71233512).

Almost surely, 2^518138387 is an apocalyptic number.

518138387 is a deficient number, since it is larger than the sum of its proper divisors (51729709).

518138387 is a wasteful number, since it uses less digits than its factorization.

518138387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848077.

The product of its digits is 161280, while the sum is 44.

The square root of 518138387 is about 22762.6533383083. The cubic root of 518138387 is about 803.1843843647.

The spelling of 518138387 in words is "five hundred eighteen million, one hundred thirty-eight thousand, three hundred eighty-seven".