531978 has 8 divisors (see below), whose sum is σ = 1063968. Its totient is φ = 177324.

The previous prime is 531977. The next prime is 531983. The reversal of 531978 is 879135.

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

531978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (531977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44326 + ... + 44337.

It is an arithmetic number, because the mean of its divisors is an integer number (132996).

2⁵³¹⁹⁷⁸ is an apocalyptic number.

531978 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.

531978 is a wasteful number, since it uses less digits than its factorization.

531978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88668.

The product of its digits is 7560, while the sum is 33.

The square root of 531978 is about 729.3682197628. The cubic root of 531978 is about 81.0272732423.

The spelling of 531978 in words is "five hundred thirty-one thousand, nine hundred seventy-eight".