386861021 has 2 divisors, whose sum is σ = 386861022. Its totient is φ = 386861020.

The previous prime is 386861003. The next prime is 386861051. The reversal of 386861021 is 120168683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344102500 + 42758521 = 18550^2 + 6539^2 .

It is an emirp because it is prime and its reverse (120168683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386861021 is a prime.

It is a super-2 number, since 2×386861021² = 299322899138324882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386861051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193430510 + 193430511.

It is an arithmetic number, because the mean of its divisors is an integer number (193430511).

Almost surely, 2^386861021 is an apocalyptic number.

It is an amenable number.

386861021 is a deficient number, since it is larger than the sum of its proper divisors (1).

386861021 is an equidigital number, since it uses as much as digits as its factorization.

386861021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 386861021 is about 19668.7829059146. The cubic root of 386861021 is about 728.6489183668.

The spelling of 386861021 in words is "three hundred eighty-six million, eight hundred sixty-one thousand, twenty-one".