517890242 has 16 divisors (see below), whose sum is σ = 792555192. Its totient is φ = 253718400.

The previous prime is 517890211. The next prime is 517890253. The reversal of 517890242 is 242098715.

It can be written as a sum of positive squares in 4 ways, for example, as 503060041 + 14830201 = 22429^2 + 3851^2 .

It is a junction number, because it is equal to n+sod(n) for n = 517890196 and 517890205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87992 + ... + 93692.

Almost surely, 2^517890242 is an apocalyptic number.

517890242 is a deficient number, since it is larger than the sum of its proper divisors (274664950).

517890242 is a wasteful number, since it uses less digits than its factorization.

517890242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6613.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 517890242 is about 22757.2019809114. The cubic root of 517890242 is about 803.0561444842.

The spelling of 517890242 in words is "five hundred seventeen million, eight hundred ninety thousand, two hundred forty-two".