386986999 has 4 divisors (see below), whose sum is σ = 442270864. Its totient is φ = 331703136.

The previous prime is 386986993. The next prime is 386987011. The reversal of 386986999 is 999689683.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 386986999 - 2¹⁹ = 386462711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386986993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27641922 + ... + 27641935.

It is an arithmetic number, because the mean of its divisors is an integer number (110567716).

Almost surely, 2^386986999 is an apocalyptic number.

386986999 is a deficient number, since it is larger than the sum of its proper divisors (55283865).

386986999 is an equidigital number, since it uses as much as digits as its factorization.

386986999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55283864.

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

The square root of 386986999 is about 19671.9851311453. The cubic root of 386986999 is about 728.7280025567.

The spelling of 386986999 in words is "three hundred eighty-six million, nine hundred eighty-six thousand, nine hundred ninety-nine".