3909849 has 4 divisors (see below), whose sum is σ = 5213136. Its totient is φ = 2606564.

The previous prime is 3909817. The next prime is 3909853. The reversal of 3909849 is 9489093.

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 3909849 - 2⁵ = 3909817 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3909849.

It is not an unprimeable number, because it can be changed into a prime (3909889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651639 + ... + 651644.

It is an arithmetic number, because the mean of its divisors is an integer number (1303284).

Almost surely, 2^3909849 is an apocalyptic number.

It is an amenable number.

3909849 is a deficient number, since it is larger than the sum of its proper divisors (1303287).

3909849 is a wasteful number, since it uses less digits than its factorization.

3909849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303286.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 3909849 is about 1977.3338109687. Note that the first 3 decimals coincide. The cubic root of 3909849 is about 157.5384839192.

The spelling of 3909849 in words is "three million, nine hundred nine thousand, eight hundred forty-nine".