312978 has 8 divisors (see below), whose sum is σ = 625968. Its totient is φ = 104324.

The previous prime is 312971. The next prime is 312979. The reversal of 312978 is 879213.

It is a happy number.

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

312978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (312971) by changing a digit.

312978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26076 + ... + 26087.

It is an arithmetic number, because the mean of its divisors is an integer number (78246).

2³¹²⁹⁷⁸ is an apocalyptic number.

312978 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.

312978 is a wasteful number, since it uses less digits than its factorization.

312978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52168.

The product of its digits is 3024, while the sum is 30.

The square root of 312978 is about 559.4443672073. Note that the first 3 decimals coincide. The cubic root of 312978 is about 67.8950225651.

The spelling of 312978 in words is "three hundred twelve thousand, nine hundred seventy-eight".