387581 has 4 divisors (see below), whose sum is σ = 408000. Its totient is φ = 367164.

The previous prime is 387577. The next prime is 387587. The reversal of 387581 is 185783.

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 387581 - 2² = 387577 is a prime.

It is a super-2 number, since 2×387581² = 300438063122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387587) 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, 10181 + ... + 10218.

It is an arithmetic number, because the mean of its divisors is an integer number (102000).

2³⁸⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

387581 is a deficient number, since it is larger than the sum of its proper divisors (20419).

387581 is a wasteful number, since it uses less digits than its factorization.

387581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20418.

The product of its digits is 6720, while the sum is 32.

The square root of 387581 is about 622.5600372655. The cubic root of 387581 is about 72.9100662688.

The spelling of 387581 in words is "three hundred eighty-seven thousand, five hundred eighty-one".