3905145 has 16 divisors (see below), whose sum is σ = 6942720. Its totient is φ = 2082672.

The previous prime is 3905119. The next prime is 3905149. The reversal of 3905145 is 5415093.

It is not a de Polignac number, because 3905145 - 2⁵ = 3905113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3905149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14329 + ... + 14598.

It is an arithmetic number, because the mean of its divisors is an integer number (433920).

Almost surely, 2^3905145 is an apocalyptic number.

It is an amenable number.

3905145 is a deficient number, since it is larger than the sum of its proper divisors (3037575).

3905145 is a wasteful number, since it uses less digits than its factorization.

3905145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28941 (or 28935 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 3905145 is about 1976.1439724878. The cubic root of 3905145 is about 157.4752795669.

The spelling of 3905145 in words is "three million, nine hundred five thousand, one hundred forty-five".