38566813 has 4 divisors (see below), whose sum is σ = 38797920. Its totient is φ = 38335708.

The previous prime is 38566811. The next prime is 38566831. The reversal of 38566813 is 31866583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38566813 - 2¹ = 38566811 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38566811) 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, 115303 + ... + 115636.

It is an arithmetic number, because the mean of its divisors is an integer number (9699480).

Almost surely, 2^38566813 is an apocalyptic number.

It is an amenable number.

38566813 is a deficient number, since it is larger than the sum of its proper divisors (231107).

38566813 is a wasteful number, since it uses less digits than its factorization.

38566813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231106.

The product of its digits is 103680, while the sum is 40.

The square root of 38566813 is about 6210.2184341616. The cubic root of 38566813 is about 337.8608865796.

The spelling of 38566813 in words is "thirty-eight million, five hundred sixty-six thousand, eight hundred thirteen".