39640043 has 2 divisors, whose sum is σ = 39640044. Its totient is φ = 39640042.

The previous prime is 39640001. The next prime is 39640079. The reversal of 39640043 is 34004693.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34004693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39640043 - 2¹⁴ = 39623659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39639988 and 39640015.

It is not a weakly prime, because it can be changed into another prime (39648043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19820021 + 19820022.

It is an arithmetic number, because the mean of its divisors is an integer number (19820022).

Almost surely, 2^39640043 is an apocalyptic number.

39640043 is a deficient number, since it is larger than the sum of its proper divisors (1).

39640043 is an equidigital number, since it uses as much as digits as its factorization.

39640043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 39640043 is about 6296.0339103280. The cubic root of 39640043 is about 340.9662336170.

The spelling of 39640043 in words is "thirty-nine million, six hundred forty thousand, forty-three".