516393947 has 4 divisors (see below), whose sum is σ = 516743640. Its totient is φ = 516044256.

The previous prime is 516393937. The next prime is 516393959. The reversal of 516393947 is 749393615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 516393947 - 2⁶ = 516393883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516393937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172622 + ... + 175587.

It is an arithmetic number, because the mean of its divisors is an integer number (129185910).

Almost surely, 2^516393947 is an apocalyptic number.

516393947 is a deficient number, since it is larger than the sum of its proper divisors (349693).

516393947 is a wasteful number, since it uses less digits than its factorization.

516393947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349692.

The product of its digits is 612360, while the sum is 47.

The square root of 516393947 is about 22724.3030036127. The cubic root of 516393947 is about 802.2819984768.

The spelling of 516393947 in words is "five hundred sixteen million, three hundred ninety-three thousand, nine hundred forty-seven".