939947009 has 8 divisors (see below), whose sum is σ = 944697600. Its totient is φ = 935205856.

The previous prime is 939946993. The next prime is 939947011. The reversal of 939947009 is 900749939.

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

It is a 3-Lehmer number, since φ(939947009) divides (939947009-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 939947009 - 2⁴ = 939946993 is a prime.

It is a deceptive number, since it divides R_939947008.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (939947909) by changing a digit.

It is a Zeisel number, with parameters (3, 260).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274184 + ... + 277590.

It is an arithmetic number, because the mean of its divisors is an integer number (118087200).

It is a Poulet number, since it divides 2^939947008-1.

Almost surely, 2^939947009 is an apocalyptic number.

It is an amenable number.

939947009 is a deficient number, since it is larger than the sum of its proper divisors (4750591).

939947009 is a wasteful number, since it uses less digits than its factorization.

939947009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 939947009 is about 30658.5552334092. Note that the first 3 decimals coincide. The cubic root of 939947009 is about 979.5677008351.

The spelling of 939947009 in words is "nine hundred thirty-nine million, nine hundred forty-seven thousand, nine".