38815685 has 4 divisors (see below), whose sum is σ = 46578828. Its totient is φ = 31052544.

The previous prime is 38815681. The next prime is 38815691. The reversal of 38815685 is 58651883.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18258529 + 20557156 = 4273^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 38815685 - 2² = 38815681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38815681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3881564 + ... + 3881573.

It is an arithmetic number, because the mean of its divisors is an integer number (11644707).

Almost surely, 2^38815685 is an apocalyptic number.

It is an amenable number.

38815685 is a deficient number, since it is larger than the sum of its proper divisors (7763143).

38815685 is an equidigital number, since it uses as much as digits as its factorization.

38815685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7763142.

The product of its digits is 230400, while the sum is 44.

The square root of 38815685 is about 6230.2235112394. The cubic root of 38815685 is about 338.5860687460.

The spelling of 38815685 in words is "thirty-eight million, eight hundred fifteen thousand, six hundred eighty-five".