38806666 has 4 divisors (see below), whose sum is σ = 58210002. Its totient is φ = 19403332.

The previous prime is 38806661. The next prime is 38806667. The reversal of 38806666 is 66660883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66660883 = 3947 ⋅16889.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 6145441 = 5715^2 + 2479^2 .

38806666 is a modest number, since divided by 6666 gives 3880 as remainder.

It is not an unprimeable number, because it can be changed into a prime (38806661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701665 + ... + 9701668.

Almost surely, 2^38806666 is an apocalyptic number.

38806666 is a deficient number, since it is larger than the sum of its proper divisors (19403336).

38806666 is a wasteful number, since it uses less digits than its factorization.

38806666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19403335.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 38806666 is about 6229.4996588811. The cubic root of 38806666 is about 338.5598427131.

The spelling of 38806666 in words is "thirty-eight million, eight hundred six thousand, six hundred sixty-six".