40309839 has 32 divisors (see below), whose sum is σ = 64463040. Its totient is φ = 24800256.

The previous prime is 40309817. The next prime is 40309853. The reversal of 40309839 is 93890304.

40309839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40309839 - 2¹⁷ = 40178767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40309439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23499 + ... + 25155.

It is an arithmetic number, because the mean of its divisors is an integer number (2014470).

Almost surely, 2^40309839 is an apocalyptic number.

40309839 is a deficient number, since it is larger than the sum of its proper divisors (24153201).

40309839 is a wasteful number, since it uses less digits than its factorization.

40309839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40309839 is about 6349.0029925966. The cubic root of 40309839 is about 342.8759478525.

The spelling of 40309839 in words is "forty million, three hundred nine thousand, eight hundred thirty-nine".