387689 has 4 divisors (see below), whose sum is σ = 394320. Its totient is φ = 381060.

The previous prime is 387683. The next prime is 387707. The reversal of 387689 is 986783.

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.

It is a cyclic number.

It is not a de Polignac number, because 387689 - 2⁸ = 387433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3227 + ... + 3344.

It is an arithmetic number, because the mean of its divisors is an integer number (98580).

2³⁸⁷⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

387689 is a deficient number, since it is larger than the sum of its proper divisors (6631).

387689 is an equidigital number, since it uses as much as digits as its factorization.

387689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6630.

The product of its digits is 72576, while the sum is 41.

The square root of 387689 is about 622.6467698463. The cubic root of 387689 is about 72.9168378046.

The spelling of 387689 in words is "three hundred eighty-seven thousand, six hundred eighty-nine".