387321 has 16 divisors (see below), whose sum is σ = 573888. Its totient is φ = 232320.

The previous prime is 387313. The next prime is 387329. The reversal of 387321 is 123783.

It is an interprime number because it is at equal distance from previous prime (387313) and next prime (387329).

It is not a de Polignac number, because 387321 - 2³ = 387313 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 387291 and 387300.

It is not an unprimeable number, because it can be changed into a prime (387329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3945 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (35868).

2³⁸⁷³²¹ is an apocalyptic number.

It is an amenable number.

387321 is a deficient number, since it is larger than the sum of its proper divisors (186567).

387321 is an equidigital number, since it uses as much as digits as its factorization.

387321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 111 counting only the distinct ones).

The product of its digits is 1008, while the sum is 24.

The square root of 387321 is about 622.3511870319. The cubic root of 387321 is about 72.8937592622.

The spelling of 387321 in words is "three hundred eighty-seven thousand, three hundred twenty-one".