3900845 has 8 divisors (see below), whose sum is σ = 5041176. Its totient is φ = 2880576.

The previous prime is 3900839. The next prime is 3900847. The reversal of 3900845 is 5480093.

It can be written as a sum of positive squares in 4 ways, for example, as 264196 + 3636649 = 514^2 + 1907^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3900845 - 2⁴ = 3900829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900847) 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 7 ways as a sum of consecutive naturals, for example, 29942 + ... + 30071.

It is an arithmetic number, because the mean of its divisors is an integer number (630147).

Almost surely, 2^3900845 is an apocalyptic number.

It is an amenable number.

3900845 is a deficient number, since it is larger than the sum of its proper divisors (1140331).

3900845 is a wasteful number, since it uses less digits than its factorization.

3900845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60031.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 3900845 is about 1975.0556954172. The cubic root of 3900845 is about 157.4174590599.

The spelling of 3900845 in words is "three million, nine hundred thousand, eight hundred forty-five".