505978986 has 8 divisors (see below), whose sum is σ = 1011957984. Its totient is φ = 168659660.

The previous prime is 505978961. The next prime is 505979021. The reversal of 505978986 is 689879505.

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

505978986 is an admirable number.

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, 42164910 + ... + 42164921.

It is an arithmetic number, because the mean of its divisors is an integer number (126494748).

Almost surely, 2^505978986 is an apocalyptic number.

505978986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505978986 is a wasteful number, since it uses less digits than its factorization.

505978986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84329836.

The product of its (nonzero) digits is 5443200, while the sum is 57.

The square root of 505978986 is about 22493.9766604307. The cubic root of 505978986 is about 796.8516815752.

The spelling of 505978986 in words is "five hundred five million, nine hundred seventy-eight thousand, nine hundred eighty-six".