505807906 has 8 divisors (see below), whose sum is σ = 758938140. Its totient is φ = 252828528.

The previous prime is 505807903. The next prime is 505807909. The reversal of 505807906 is 609708505.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (505807903) and next prime (505807909).

It can be written as a sum of positive squares in 2 ways, for example, as 457574881 + 48233025 = 21391^2 + 6945^2 .

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

It is not an unprimeable number, because it can be changed into a prime (505807901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28921 + ... + 42988.

Almost surely, 2^505807906 is an apocalyptic number.

505807906 is a deficient number, since it is larger than the sum of its proper divisors (253130234).

505807906 is a wasteful number, since it uses less digits than its factorization.

505807906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75428.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 505807906 is about 22490.1735431277. The cubic root of 505807906 is about 796.7618618021.

The spelling of 505807906 in words is "five hundred five million, eight hundred seven thousand, nine hundred six".