386867021 has 12 divisors (see below), whose sum is σ = 398240436. Its totient is φ = 375809280.

The previous prime is 386867017. The next prime is 386867059. The reversal of 386867021 is 120768683.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 218152900 + 168714121 = 14770^2 + 12989^2 .

It is not a de Polignac number, because 386867021 - 2² = 386867017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 386867021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386861021) 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 in 11 ways as a sum of consecutive naturals, for example, 626705 + ... + 627321.

It is an arithmetic number, because the mean of its divisors is an integer number (33186703).

Almost surely, 2^386867021 is an apocalyptic number.

It is an amenable number.

386867021 is a deficient number, since it is larger than the sum of its proper divisors (11373415).

386867021 is an equidigital number, since it uses as much as digits as its factorization.

386867021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 386867021 is about 19668.9354312835. The cubic root of 386867021 is about 728.6526853276.

The spelling of 386867021 in words is "three hundred eighty-six million, eight hundred sixty-seven thousand, twenty-one".