38387665 has 4 divisors (see below), whose sum is σ = 46065204. Its totient is φ = 30710128.

The previous prime is 38387659. The next prime is 38387681. The reversal of 38387665 is 56678383.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56678383 = 29 ⋅1954427.

It can be written as a sum of positive squares in 2 ways, for example, as 6713281 + 31674384 = 2591^2 + 5628^2 .

It is a cyclic number.

It is not a de Polignac number, because 38387665 - 2⁵ = 38387633 is a prime.

It is a super-2 number, since 2×38387665² = 2947225648304450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3838762 + ... + 3838771.

It is an arithmetic number, because the mean of its divisors is an integer number (11516301).

Almost surely, 2^38387665 is an apocalyptic number.

It is an amenable number.

38387665 is a deficient number, since it is larger than the sum of its proper divisors (7677539).

38387665 is an equidigital number, since it uses as much as digits as its factorization.

38387665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7677538.

The product of its digits is 725760, while the sum is 46.

The square root of 38387665 is about 6195.7779979596. Note that the first 3 decimals coincide. The cubic root of 38387665 is about 337.3369381481.

The spelling of 38387665 in words is "thirty-eight million, three hundred eighty-seven thousand, six hundred sixty-five".