517440394 has 8 divisors (see below), whose sum is σ = 776323908. Its totient is φ = 258665760.

The previous prime is 517440383. The next prime is 517440401. The reversal of 517440394 is 493044715.

It can be written as a sum of positive squares in 2 ways, for example, as 516971169 + 469225 = 22737^2 + 685^2 .

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

It is a super-2 number, since 2×517440394² = 535489122685750472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14067 + ... + 35110.

Almost surely, 2^517440394 is an apocalyptic number.

517440394 is a deficient number, since it is larger than the sum of its proper divisors (258883514).

517440394 is a wasteful number, since it uses less digits than its factorization.

517440394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54440.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 517440394 is about 22747.3161933447. The cubic root of 517440394 is about 802.8235611950.

The spelling of 517440394 in words is "five hundred seventeen million, four hundred forty thousand, three hundred ninety-four".