320073997 has 4 divisors (see below), whose sum is σ = 325499040. Its totient is φ = 314648956.

The previous prime is 320073937. The next prime is 320074009. The reversal of 320073997 is 799370023.

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, and also an emirpimes, since its reverse is a distinct semiprime: 799370023 = 113 ⋅7074071.

It is a cyclic number.

It is not a de Polignac number, because 320073997 - 2⁷ = 320073869 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 (320073917) 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, 2712433 + ... + 2712550.

It is an arithmetic number, because the mean of its divisors is an integer number (81374760).

Almost surely, 2^320073997 is an apocalyptic number.

It is an amenable number.

320073997 is a deficient number, since it is larger than the sum of its proper divisors (5425043).

320073997 is an equidigital number, since it uses as much as digits as its factorization.

320073997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425042.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 320073997 is about 17890.6119794712. The cubic root of 320073997 is about 684.0430967283.

The spelling of 320073997 in words is "three hundred twenty million, seventy-three thousand, nine hundred ninety-seven".