38666861 has 2 divisors, whose sum is σ = 38666862. Its totient is φ = 38666860.

The previous prime is 38666833. The next prime is 38666939. The reversal of 38666861 is 16866683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 164836 = 6205^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 38666861 - 2¹⁴ = 38650477 is a prime.

It is a super-2 number, since 2×38666861² = 2990252279186642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38666821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19333430 + 19333431.

It is an arithmetic number, because the mean of its divisors is an integer number (19333431).

Almost surely, 2^38666861 is an apocalyptic number.

It is an amenable number.

38666861 is a deficient number, since it is larger than the sum of its proper divisors (1).

38666861 is an equidigital number, since it uses as much as digits as its factorization.

38666861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 38666861 is about 6218.2683280798. The cubic root of 38666861 is about 338.1527879668.

The spelling of 38666861 in words is "thirty-eight million, six hundred sixty-six thousand, eight hundred sixty-one".