39897443 has 2 divisors, whose sum is σ = 39897444. Its totient is φ = 39897442.

The previous prime is 39897437. The next prime is 39897461. The reversal of 39897443 is 34479893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39897443 - 2⁴ = 39897427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (39897463) 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, 19948721 + 19948722.

It is an arithmetic number, because the mean of its divisors is an integer number (19948722).

Almost surely, 2^39897443 is an apocalyptic number.

39897443 is a deficient number, since it is larger than the sum of its proper divisors (1).

39897443 is an equidigital number, since it uses as much as digits as its factorization.

39897443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 39897443 is about 6316.4422739387. The cubic root of 39897443 is about 341.7026558428.

The spelling of 39897443 in words is "thirty-nine million, eight hundred ninety-seven thousand, four hundred forty-three".