4009939 has 2 divisors, whose sum is σ = 4009940. Its totient is φ = 4009938.

The previous prime is 4009933. The next prime is 4009991. The reversal of 4009939 is 9399004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4009939 - 2¹⁷ = 3878867 is a prime.

It is a super-2 number, since 2×4009939² = 32159221567442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4009933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004969 + 2004970.

It is an arithmetic number, because the mean of its divisors is an integer number (2004970).

Almost surely, 2^4009939 is an apocalyptic number.

4009939 is a deficient number, since it is larger than the sum of its proper divisors (1).

4009939 is an equidigital number, since it uses as much as digits as its factorization.

4009939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 4009939 is about 2002.4832084190. The cubic root of 4009939 is about 158.8714729436.

The spelling of 4009939 in words is "four million, nine thousand, nine hundred thirty-nine".