386721 has 8 divisors (see below), whose sum is σ = 572960. Its totient is φ = 257796.

The previous prime is 386719. The next prime is 386723. The reversal of 386721 is 127683.

It is an interprime number because it is at equal distance from previous prime (386719) and next prime (386723).

It is not a de Polignac number, because 386721 - 2¹ = 386719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 14323 = 386721 / (3 + 8 + 6 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386723) 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, 7135 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (71620).

2³⁸⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

386721 is a deficient number, since it is larger than the sum of its proper divisors (186239).

386721 is a wasteful number, since it uses less digits than its factorization.

386721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14332 (or 14326 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 386721 is about 621.8689572571. The cubic root of 386721 is about 72.8560998368.

The spelling of 386721 in words is "three hundred eighty-six thousand, seven hundred twenty-one".