39840039 has 16 divisors (see below), whose sum is σ = 59119840. Its totient is φ = 26516160.

The previous prime is 39840037. The next prime is 39840103. The reversal of 39840039 is 93004893.

It is not a de Polignac number, because 39840039 - 2¹ = 39840037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39839985 and 39840012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39840037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29499 + ... + 30819.

It is an arithmetic number, because the mean of its divisors is an integer number (3694990).

Almost surely, 2^39840039 is an apocalyptic number.

39840039 is a deficient number, since it is larger than the sum of its proper divisors (19279801).

39840039 is a wasteful number, since it uses less digits than its factorization.

39840039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2441 counting only the distinct ones).

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

The square root of 39840039 is about 6311.8966246288. The cubic root of 39840039 is about 341.5386978492.

The spelling of 39840039 in words is "thirty-nine million, eight hundred forty thousand, thirty-nine".