307997 has 4 divisors (see below), whose sum is σ = 309120. Its totient is φ = 306876.

The previous prime is 307969. The next prime is 308003. The reversal of 307997 is 799703.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 799703 = 733 ⋅1091.

It is a cyclic number.

It is not a de Polignac number, because 307997 - 2¹⁸ = 45853 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307397) 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, 158 + ... + 800.

It is an arithmetic number, because the mean of its divisors is an integer number (77280).

2³⁰⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

307997 is a deficient number, since it is larger than the sum of its proper divisors (1123).

307997 is an equidigital number, since it uses as much as digits as its factorization.

307997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its (nonzero) digits is 11907, while the sum is 35.

The square root of 307997 is about 554.9747742015. The cubic root of 307997 is about 67.5329149028.

The spelling of 307997 in words is "three hundred seven thousand, nine hundred ninety-seven".