387997 has 4 divisors (see below), whose sum is σ = 393856. Its totient is φ = 382140.

The previous prime is 387977. The next prime is 388009. The reversal of 387997 is 799783.

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: 799783 = 263 ⋅3041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387997 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 (387917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829 + ... + 2962.

It is an arithmetic number, because the mean of its divisors is an integer number (98464).

2³⁸⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

387997 is a deficient number, since it is larger than the sum of its proper divisors (5859).

387997 is an equidigital number, since it uses as much as digits as its factorization.

387997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858.

The product of its digits is 95256, while the sum is 43.

The square root of 387997 is about 622.8940519864. The cubic root of 387997 is about 72.9361423170.

The spelling of 387997 in words is "three hundred eighty-seven thousand, nine hundred ninety-seven".