505278 has 20 divisors (see below), whose sum is σ = 1132560. Its totient is φ = 168372.

The previous prime is 505277. The next prime is 505279. The reversal of 505278 is 872505.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (505277) and next prime (505279).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505277) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1398 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (56628).

2⁵⁰⁵²⁷⁸ is an apocalyptic number.

505278 is an abundant number, since it is smaller than the sum of its proper divisors (627282).

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

505278 is a wasteful number, since it uses less digits than its factorization.

505278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133 (or 3124 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 505278 is about 710.8290933832. The cubic root of 505278 is about 79.6483523976.

The spelling of 505278 in words is "five hundred five thousand, two hundred seventy-eight".