38666659 has 4 divisors (see below), whose sum is σ = 38685304. Its totient is φ = 38648016.

The previous prime is 38666647. The next prime is 38666669. The reversal of 38666659 is 95666683.

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 38666659 - 2¹⁵ = 38633891 is a prime.

It is a super-2 number, since 2×38666659² = 2990221036444562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38666669) 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, 5757 + ... + 10510.

It is an arithmetic number, because the mean of its divisors is an integer number (9671326).

Almost surely, 2^38666659 is an apocalyptic number.

38666659 is a deficient number, since it is larger than the sum of its proper divisors (18645).

38666659 is a wasteful number, since it uses less digits than its factorization.

38666659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18644.

The product of its digits is 1399680, while the sum is 49.

The square root of 38666659 is about 6218.2520855945. The cubic root of 38666659 is about 338.1521991165.

The spelling of 38666659 in words is "thirty-eight million, six hundred sixty-six thousand, six hundred fifty-nine".