386700221 has 2 divisors, whose sum is σ = 386700222. Its totient is φ = 386700220.

The previous prime is 386700187. The next prime is 386700227. The reversal of 386700221 is 122007683.

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., 379704196 + 6996025 = 19486^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 386700221 - 2⁶ = 386700157 is a prime.

It is equal to p_20664227 and since 386700221 and 20664227 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386700227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193350110 + 193350111.

It is an arithmetic number, because the mean of its divisors is an integer number (193350111).

Almost surely, 2^386700221 is an apocalyptic number.

It is an amenable number.

386700221 is a deficient number, since it is larger than the sum of its proper divisors (1).

386700221 is an equidigital number, since it uses as much as digits as its factorization.

386700221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 386700221 is about 19664.6947853253. The cubic root of 386700221 is about 728.5479493047.

The spelling of 386700221 in words is "three hundred eighty-six million, seven hundred thousand, two hundred twenty-one".