39640443 has 4 divisors (see below), whose sum is σ = 52853928. Its totient is φ = 26426960.

The previous prime is 39640439. The next prime is 39640457. The reversal of 39640443 is 34404693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39640443 - 2² = 39640439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39640493) 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, 6606738 + ... + 6606743.

It is an arithmetic number, because the mean of its divisors is an integer number (13213482).

Almost surely, 2^39640443 is an apocalyptic number.

39640443 is a deficient number, since it is larger than the sum of its proper divisors (13213485).

39640443 is a wasteful number, since it uses less digits than its factorization.

39640443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213484.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 39640443 is about 6296.0656762775. The cubic root of 39640443 is about 340.9673804879.

The spelling of 39640443 in words is "thirty-nine million, six hundred forty thousand, four hundred forty-three".