312457643 has 4 divisors (see below), whose sum is σ = 312844680. Its totient is φ = 312070608.

The previous prime is 312457633. The next prime is 312457667. The reversal of 312457643 is 346754213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312457643 - 2⁴ = 312457627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312457633) 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, 192305 + ... + 193922.

It is an arithmetic number, because the mean of its divisors is an integer number (78211170).

Almost surely, 2^312457643 is an apocalyptic number.

312457643 is a deficient number, since it is larger than the sum of its proper divisors (387037).

312457643 is an equidigital number, since it uses as much as digits as its factorization.

312457643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387036.

The product of its digits is 60480, while the sum is 35.

The square root of 312457643 is about 17676.4714521875. The cubic root of 312457643 is about 678.5737428735.

The spelling of 312457643 in words is "three hundred twelve million, four hundred fifty-seven thousand, six hundred forty-three".