387391 has 4 divisors (see below), whose sum is σ = 407800. Its totient is φ = 366984.

The previous prime is 387371. The next prime is 387397. The reversal of 387391 is 193783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193783 = 17 ⋅11399.

It is a cyclic number.

It is not a de Polignac number, because 387391 - 2⁷ = 387263 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 (387397) 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, 10176 + ... + 10213.

It is an arithmetic number, because the mean of its divisors is an integer number (101950).

2³⁸⁷³⁹¹ is an apocalyptic number.

387391 is a deficient number, since it is larger than the sum of its proper divisors (20409).

387391 is a wasteful number, since it uses less digits than its factorization.

387391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20408.

The product of its digits is 4536, while the sum is 31.

The square root of 387391 is about 622.4074228349. The cubic root of 387391 is about 72.8981503279.

The spelling of 387391 in words is "three hundred eighty-seven thousand, three hundred ninety-one".