38664281 has 2 divisors, whose sum is σ = 38664282. Its totient is φ = 38664280.

The previous prime is 38664217. The next prime is 38664287. The reversal of 38664281 is 18246683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 15054400 = 4859^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 38664281 - 2⁶ = 38664217 is a prime.

It is a super-2 number, since 2×38664281² = 2989853250493922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38664287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19332140 + 19332141.

It is an arithmetic number, because the mean of its divisors is an integer number (19332141).

Almost surely, 2^38664281 is an apocalyptic number.

It is an amenable number.

38664281 is a deficient number, since it is larger than the sum of its proper divisors (1).

38664281 is an equidigital number, since it uses as much as digits as its factorization.

38664281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 38664281 is about 6218.0608713650. The cubic root of 38664281 is about 338.1452668529.

The spelling of 38664281 in words is "thirty-eight million, six hundred sixty-four thousand, two hundred eighty-one".