518993407 has 2 divisors, whose sum is σ = 518993408. Its totient is φ = 518993406.

The previous prime is 518993399. The next prime is 518993477. The reversal of 518993407 is 704399815.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 518993407 - 2³ = 518993399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518993477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259496703 + 259496704.

It is an arithmetic number, because the mean of its divisors is an integer number (259496704).

Almost surely, 2^518993407 is an apocalyptic number.

518993407 is a deficient number, since it is larger than the sum of its proper divisors (1).

518993407 is an equidigital number, since it uses as much as digits as its factorization.

518993407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 518993407 is about 22781.4267990396. The cubic root of 518993407 is about 803.6259403458.

It can be divided in two parts, 5189 and 93407, that added together give a square (98596 = 314²).

The spelling of 518993407 in words is "five hundred eighteen million, nine hundred ninety-three thousand, four hundred seven".