39639989 has 8 divisors (see below), whose sum is σ = 40729920. Its totient is φ = 38556000.

The previous prime is 39639973. The next prime is 39639997. The reversal of 39639989 is 98993693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39639989 - 2⁴ = 39639973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39639959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14264 + ... + 16814.

It is an arithmetic number, because the mean of its divisors is an integer number (5091240).

Almost surely, 2^39639989 is an apocalyptic number.

It is an amenable number.

39639989 is a deficient number, since it is larger than the sum of its proper divisors (1089931).

39639989 is a wasteful number, since it uses less digits than its factorization.

39639989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its digits is 2834352, while the sum is 56.

The square root of 39639989 is about 6296.0296219125. The cubic root of 39639989 is about 340.9660787888.

The spelling of 39639989 in words is "thirty-nine million, six hundred thirty-nine thousand, nine hundred eighty-nine".