312478 has 8 divisors (see below), whose sum is σ = 489168. Its totient is φ = 149424.

The previous prime is 312469. The next prime is 312509. The reversal of 312478 is 874213.

312478 is nontrivially palindromic in base 13.

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

It is a super-3 number, since 3×312478³ = 91533399798718056, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

312478 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, 3351 + ... + 3442.

It is an arithmetic number, because the mean of its divisors is an integer number (61146).

2³¹²⁴⁷⁸ is an apocalyptic number.

312478 is a deficient number, since it is larger than the sum of its proper divisors (176690).

312478 is a wasteful number, since it uses less digits than its factorization.

312478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818.

The product of its digits is 1344, while the sum is 25.

The square root of 312478 is about 558.9973166304. The cubic root of 312478 is about 67.8588479192.

The spelling of 312478 in words is "three hundred twelve thousand, four hundred seventy-eight".