501978 has 8 divisors (see below), whose sum is σ = 1003968. Its totient is φ = 167324.

The previous prime is 501971. The next prime is 501997. The reversal of 501978 is 879105.

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

501978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501971) by changing a digit.

501978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41826 + ... + 41837.

It is an arithmetic number, because the mean of its divisors is an integer number (125496).

2⁵⁰¹⁹⁷⁸ is an apocalyptic number.

501978 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.

501978 is a wasteful number, since it uses less digits than its factorization.

501978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83668.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 501978 is about 708.5040578571. The cubic root of 501978 is about 79.4745775285.

It can be divided in two parts, 50197 and 8, that added together give a palindrome (50205).

The spelling of 501978 in words is "five hundred one thousand, nine hundred seventy-eight".