39995989 has 4 divisors (see below), whose sum is σ = 43632000. Its totient is φ = 36359980.

The previous prime is 39995987. The next prime is 39996023. The reversal of 39995989 is 98959993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39995989 - 2¹ = 39995987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39995981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1817989 + ... + 1818010.

It is an arithmetic number, because the mean of its divisors is an integer number (10908000).

Almost surely, 2^39995989 is an apocalyptic number.

It is an amenable number.

39995989 is a deficient number, since it is larger than the sum of its proper divisors (3636011).

39995989 is a wasteful number, since it uses less digits than its factorization.

39995989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636010.

The product of its digits is 7085880, while the sum is 61.

The square root of 39995989 is about 6324.2382149948. The cubic root of 39995989 is about 341.9837577640.

The spelling of 39995989 in words is "thirty-nine million, nine hundred ninety-five thousand, nine hundred eighty-nine".