386999689 has 2 divisors, whose sum is σ = 386999690. Its totient is φ = 386999688.

The previous prime is 386999681. The next prime is 386999707. The reversal of 386999689 is 986999683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252555664 + 134444025 = 15892^2 + 11595^2 .

It is a cyclic number.

It is not a de Polignac number, because 386999689 - 2³ = 386999681 is a prime.

It is not a weakly prime, because it can be changed into another prime (386999681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193499844 + 193499845.

It is an arithmetic number, because the mean of its divisors is an integer number (193499845).

Almost surely, 2^386999689 is an apocalyptic number.

It is an amenable number.

386999689 is a deficient number, since it is larger than the sum of its proper divisors (1).

386999689 is an equidigital number, since it uses as much as digits as its factorization.

386999689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45349632, while the sum is 67.

The square root of 386999689 is about 19672.3076683952. The cubic root of 386999689 is about 728.7359679037.

The spelling of 386999689 in words is "three hundred eighty-six million, nine hundred ninety-nine thousand, six hundred eighty-nine".