38666687 has 4 divisors (see below), whose sum is σ = 40941216. Its totient is φ = 36392160.

The previous prime is 38666669. The next prime is 38666689. The reversal of 38666687 is 78666683.

38666687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78666683 = 757 ⋅103919.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38666687 is a prime.

It is a super-2 number, since 2×38666687² = 2990225367111938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1137239 + ... + 1137272.

It is an arithmetic number, because the mean of its divisors is an integer number (10235304).

Almost surely, 2^38666687 is an apocalyptic number.

38666687 is a deficient number, since it is larger than the sum of its proper divisors (2274529).

38666687 is a wasteful number, since it uses less digits than its factorization.

38666687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274528.

The product of its digits is 1741824, while the sum is 50.

The square root of 38666687 is about 6218.2543370306. The cubic root of 38666687 is about 338.1522807394.

The spelling of 38666687 in words is "thirty-eight million, six hundred sixty-six thousand, six hundred eighty-seven".