39909042 has 24 divisors (see below), whose sum is σ = 87267180. Its totient is φ = 13180320.

The previous prime is 39909011. The next prime is 39909043. The reversal of 39909042 is 24090993.

39909042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38825361 + 1083681 = 6231^2 + 1041^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39908988 and 39909006.

It is not an unprimeable number, because it can be changed into a prime (39909043) 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 11 ways as a sum of consecutive naturals, for example, 8209 + ... + 12132.

Almost surely, 2^39909042 is an apocalyptic number.

39909042 is an abundant number, since it is smaller than the sum of its proper divisors (47358138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39909042 is a wasteful number, since it uses less digits than its factorization.

39909042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20458 (or 20455 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 39909042 is about 6317.3603664822. The cubic root of 39909042 is about 341.7357659437.

The spelling of 39909042 in words is "thirty-nine million, nine hundred nine thousand, forty-two".