312820847 has 4 divisors (see below), whose sum is σ = 313722696. Its totient is φ = 311919000.

The previous prime is 312820843. The next prime is 312820873. The reversal of 312820847 is 748028213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748028213 = 2083 ⋅359111.

It is a cyclic number.

It is not a de Polignac number, because 312820847 - 2² = 312820843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312820843) 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, 450404 + ... + 451097.

It is an arithmetic number, because the mean of its divisors is an integer number (78430674).

Almost surely, 2^312820847 is an apocalyptic number.

312820847 is a deficient number, since it is larger than the sum of its proper divisors (901849).

312820847 is an equidigital number, since it uses as much as digits as its factorization.

312820847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901848.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 312820847 is about 17686.7421251060. The cubic root of 312820847 is about 678.8365681115.

The spelling of 312820847 in words is "three hundred twelve million, eight hundred twenty thousand, eight hundred forty-seven".