39902689 has 4 divisors (see below), whose sum is σ = 42249924. Its totient is φ = 37555456.

The previous prime is 39902669. The next prime is 39902701. The reversal of 39902689 is 98620993.

It is a happy number.

39902689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20322064 + 19580625 = 4508^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 39902689 - 2²³ = 31514081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39902609) 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 3 ways as a sum of consecutive naturals, for example, 1173592 + ... + 1173625.

It is an arithmetic number, because the mean of its divisors is an integer number (10562481).

Almost surely, 2^39902689 is an apocalyptic number.

It is an amenable number.

39902689 is a deficient number, since it is larger than the sum of its proper divisors (2347235).

39902689 is a wasteful number, since it uses less digits than its factorization.

39902689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347234.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 39902689 is about 6316.8575257006. The cubic root of 39902689 is about 341.7176316862.

The spelling of 39902689 in words is "thirty-nine million, nine hundred two thousand, six hundred eighty-nine".