39905849 has 4 divisors (see below), whose sum is σ = 40833936. Its totient is φ = 38977764.

The previous prime is 39905809. The next prime is 39905857. The reversal of 39905849 is 94850993.

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 39905849 - 2¹⁶ = 39840313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39905809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463979 + ... + 464064.

It is an arithmetic number, because the mean of its divisors is an integer number (10208484).

Almost surely, 2^39905849 is an apocalyptic number.

It is an amenable number.

39905849 is a deficient number, since it is larger than the sum of its proper divisors (928087).

39905849 is an equidigital number, since it uses as much as digits as its factorization.

39905849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928086.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 39905849 is about 6317.1076451173. The cubic root of 39905849 is about 341.7266519572.

The spelling of 39905849 in words is "thirty-nine million, nine hundred five thousand, eight hundred forty-nine".