387291 has 4 divisors (see below), whose sum is σ = 516392. Its totient is φ = 258192.

The previous prime is 387281. The next prime is 387307. The reversal of 387291 is 192783.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 387291 - 2⁶ = 387227 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387281) 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, 64546 + ... + 64551.

It is an arithmetic number, because the mean of its divisors is an integer number (129098).

2³⁸⁷²⁹¹ is an apocalyptic number.

387291 is a deficient number, since it is larger than the sum of its proper divisors (129101).

387291 is a wasteful number, since it uses less digits than its factorization.

387291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129100.

The product of its digits is 3024, while the sum is 30.

The square root of 387291 is about 622.3270844178. The cubic root of 387291 is about 72.8918772150.

The spelling of 387291 in words is "three hundred eighty-seven thousand, two hundred ninety-one".