386521 has 2 divisors, whose sum is σ = 386522. Its totient is φ = 386520.

The previous prime is 386501. The next prime is 386537. The reversal of 386521 is 125683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287296 + 99225 = 536^2 + 315^2 .

It is an emirp because it is prime and its reverse (125683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 386521 - 2⁵ = 386489 is a prime.

It is not a weakly prime, because it can be changed into another prime (386501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193260 + 193261.

It is an arithmetic number, because the mean of its divisors is an integer number (193261).

2³⁸⁶⁵²¹ is an apocalyptic number.

It is an amenable number.

386521 is a deficient number, since it is larger than the sum of its proper divisors (1).

386521 is an equidigital number, since it uses as much as digits as its factorization.

386521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 386521 is about 621.7081308781. The cubic root of 386521 is about 72.8435380393.

The spelling of 386521 in words is "three hundred eighty-six thousand, five hundred twenty-one".