3905249 has 4 divisors (see below), whose sum is σ = 3910164. Its totient is φ = 3900336.

The previous prime is 3905221. The next prime is 3905263. The reversal of 3905249 is 9425093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3265249 + 640000 = 1807^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 3905249 - 2¹² = 3901153 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3905219) 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, 962 + ... + 2955.

It is an arithmetic number, because the mean of its divisors is an integer number (977541).

Almost surely, 2^3905249 is an apocalyptic number.

It is an amenable number.

3905249 is a deficient number, since it is larger than the sum of its proper divisors (4915).

3905249 is an equidigital number, since it uses as much as digits as its factorization.

3905249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 3905249 is about 1976.1702861849. The cubic root of 3905249 is about 157.4766774906.

The spelling of 3905249 in words is "three million, nine hundred five thousand, two hundred forty-nine".