386999685 has 12 divisors (see below), whose sum is σ = 670799532. Its totient is φ = 206399808.

The previous prime is 386999681. The next prime is 386999689. The reversal of 386999685 is 586999683.

386999685 is a `hidden beast` number, since 386 + 99 + 96 + 85 = 666.

It is an interprime number because it is at equal distance from previous prime (386999681) and next prime (386999689).

It can be written as a sum of positive squares in 2 ways, for example, as 58339044 + 328660641 = 7638^2 + 18129^2 .

It is not a de Polignac number, because 386999685 - 2² = 386999681 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386999681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4299952 + ... + 4300041.

It is an arithmetic number, because the mean of its divisors is an integer number (55899961).

Almost surely, 2^386999685 is an apocalyptic number.

It is an amenable number.

386999685 is a deficient number, since it is larger than the sum of its proper divisors (283799847).

386999685 is a wasteful number, since it uses less digits than its factorization.

386999685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8600004 (or 8600001 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The square root of 386999685 is about 19672.3075667294. The cubic root of 386999685 is about 728.7359653930.

It can be divided in two parts, 38699 and 9685, that added together give a palindrome (48384).

The spelling of 386999685 in words is "three hundred eighty-six million, nine hundred ninety-nine thousand, six hundred eighty-five".