520409194 has 4 divisors (see below), whose sum is σ = 780613794. Its totient is φ = 260204596.

The previous prime is 520409179. The next prime is 520409203. The reversal of 520409194 is 491904025.

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

It can be written as a sum of positive squares in only one way, i.e., 475022025 + 45387169 = 21795^2 + 6737^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130102297 + ... + 130102300.

Almost surely, 2^520409194 is an apocalyptic number.

520409194 is a deficient number, since it is larger than the sum of its proper divisors (260204600).

520409194 is a wasteful number, since it uses less digits than its factorization.

520409194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260204599.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 520409194 is about 22812.4789095793. The cubic root of 520409194 is about 804.3560267803.

The spelling of 520409194 in words is "five hundred twenty million, four hundred nine thousand, one hundred ninety-four".