38666899 has 4 divisors (see below), whose sum is σ = 38683840. Its totient is φ = 38649960.

The previous prime is 38666861. The next prime is 38666939. The reversal of 38666899 is 99866683.

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 38666899 - 2²⁵ = 5112467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38666099) 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, 4392 + ... + 9829.

It is an arithmetic number, because the mean of its divisors is an integer number (9670960).

Almost surely, 2^38666899 is an apocalyptic number.

38666899 is a deficient number, since it is larger than the sum of its proper divisors (16941).

38666899 is a wasteful number, since it uses less digits than its factorization.

38666899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16940.

The product of its digits is 3359232, while the sum is 55.

The square root of 38666899 is about 6218.2713835921. The cubic root of 38666899 is about 338.1528987404.

The spelling of 38666899 in words is "thirty-eight million, six hundred sixty-six thousand, eight hundred ninety-nine".