512978 has 4 divisors (see below), whose sum is σ = 769470. Its totient is φ = 256488.

The previous prime is 512977. The next prime is 512989. The reversal of 512978 is 879215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879215 = 5 ⋅175843.

It can be written as a sum of positive squares in only one way, i.e., 494209 + 18769 = 703^2 + 137^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (512977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128243 + ... + 128246.

2⁵¹²⁹⁷⁸ is an apocalyptic number.

512978 is a deficient number, since it is larger than the sum of its proper divisors (256492).

512978 is a wasteful number, since it uses less digits than its factorization.

512978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256491.

The product of its digits is 5040, while the sum is 32.

The square root of 512978 is about 716.2248250375. The cubic root of 512978 is about 80.0509051015.

The spelling of 512978 in words is "five hundred twelve thousand, nine hundred seventy-eight".