38642449 has 2 divisors, whose sum is σ = 38642450. Its totient is φ = 38642448.

The previous prime is 38642419. The next prime is 38642453. The reversal of 38642449 is 94424683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38526849 + 115600 = 6207^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 38642449 - 2⁹ = 38641937 is a prime.

It is not a weakly prime, because it can be changed into another prime (38642419) 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, 19321224 + 19321225.

It is an arithmetic number, because the mean of its divisors is an integer number (19321225).

Almost surely, 2^38642449 is an apocalyptic number.

It is an amenable number.

38642449 is a deficient number, since it is larger than the sum of its proper divisors (1).

38642449 is an equidigital number, since it uses as much as digits as its factorization.

38642449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 38642449 is about 6216.3050922554. The cubic root of 38642449 is about 338.0816096719.

The spelling of 38642449 in words is "thirty-eight million, six hundred forty-two thousand, four hundred forty-nine".