39381493 has 2 divisors, whose sum is σ = 39381494. Its totient is φ = 39381492.

The previous prime is 39381487. The next prime is 39381523. The reversal of 39381493 is 39418393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38415204 + 966289 = 6198^2 + 983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39381493 is a prime.

It is equal to p_2398297 and since 39381493 and 2398297 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39381473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19690746 + 19690747.

It is an arithmetic number, because the mean of its divisors is an integer number (19690747).

Almost surely, 2^39381493 is an apocalyptic number.

It is an amenable number.

39381493 is a deficient number, since it is larger than the sum of its proper divisors (1).

39381493 is an equidigital number, since it uses as much as digits as its factorization.

39381493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 39381493 is about 6275.4675523024. The cubic root of 39381493 is about 340.2233048630.

The spelling of 39381493 in words is "thirty-nine million, three hundred eighty-one thousand, four hundred ninety-three".