387681 has 8 divisors (see below), whose sum is σ = 590784. Its totient is φ = 221520.

The previous prime is 387679. The next prime is 387683. The reversal of 387681 is 186783.

It is an interprime number because it is at equal distance from previous prime (387679) and next prime (387683).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 387681 - 2¹ = 387679 is a prime.

It is a super-2 number, since 2×387681² = 300593115522, which contains 22 as substring.

It is a Curzon number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9210 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (73848).

2³⁸⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

387681 is a deficient number, since it is larger than the sum of its proper divisors (203103).

387681 is a wasteful number, since it uses less digits than its factorization.

387681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18471.

The product of its digits is 8064, while the sum is 33.

The square root of 387681 is about 622.6403456250. The cubic root of 387681 is about 72.9163362525.

The spelling of 387681 in words is "three hundred eighty-seven thousand, six hundred eighty-one".