312403 has 8 divisors (see below), whose sum is σ = 384608. Its totient is φ = 247104.

The previous prime is 312401. The next prime is 312407. The reversal of 312403 is 304213.

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

It is not a de Polignac number, because 312403 - 2¹ = 312401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (312401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626 + ... + 1807.

It is an arithmetic number, because the mean of its divisors is an integer number (48076).

2³¹²⁴⁰³ is an apocalyptic number.

312403 is a deficient number, since it is larger than the sum of its proper divisors (72205).

312403 is a wasteful number, since it uses less digits than its factorization.

312403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 312403 is about 558.9302282038. The cubic root of 312403 is about 67.8534183947.

Adding to 312403 its reverse (304213), we get a palindrome (616616).

The spelling of 312403 in words is "three hundred twelve thousand, four hundred three", and thus it is an iban number.