39842643 has 4 divisors (see below), whose sum is σ = 53123528. Its totient is φ = 26561760.

The previous prime is 39842633. The next prime is 39842651. The reversal of 39842643 is 34624893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34624893 = 3 ⋅11541631.

It is not a de Polignac number, because 39842643 - 2¹⁷ = 39711571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39842603) 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 in 3 ways as a sum of consecutive naturals, for example, 6640438 + ... + 6640443.

It is an arithmetic number, because the mean of its divisors is an integer number (13280882).

Almost surely, 2^39842643 is an apocalyptic number.

39842643 is a deficient number, since it is larger than the sum of its proper divisors (13280885).

39842643 is a wasteful number, since it uses less digits than its factorization.

39842643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13280884.

The product of its digits is 124416, while the sum is 39.

The square root of 39842643 is about 6312.1028984008. The cubic root of 39842643 is about 341.5461388342.

The spelling of 39842643 in words is "thirty-nine million, eight hundred forty-two thousand, six hundred forty-three".