312403421 has 4 divisors (see below), whose sum is σ = 340803744. Its totient is φ = 284003100.

The previous prime is 312403391. The next prime is 312403423. The reversal of 312403421 is 124304213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312403421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312403393 and 312403402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312403423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14200145 + ... + 14200166.

It is an arithmetic number, because the mean of its divisors is an integer number (85200936).

Almost surely, 2^312403421 is an apocalyptic number.

It is an amenable number.

312403421 is a deficient number, since it is larger than the sum of its proper divisors (28400323).

312403421 is a wasteful number, since it uses less digits than its factorization.

312403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28400322.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 312403421 is about 17674.9376519410. The cubic root of 312403421 is about 678.5344887487.

Adding to 312403421 its reverse (124304213), we get a palindrome (436707634).

The spelling of 312403421 in words is "three hundred twelve million, four hundred three thousand, four hundred twenty-one".