3871945 has 32 divisors (see below), whose sum is σ = 5909760. Its totient is φ = 2365440.

The previous prime is 3871921. The next prime is 3871961. The reversal of 3871945 is 5491783.

3871945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3871945 - 2⁷ = 3871817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34209 + ... + 34321.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

Almost surely, 2^3871945 is an apocalyptic number.

3871945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3871945 is a deficient number, since it is larger than the sum of its proper divisors (2037815).

3871945 is a wasteful number, since it uses less digits than its factorization.

3871945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 30240, while the sum is 37.

The square root of 3871945 is about 1967.7258447253. The cubic root of 3871945 is about 157.0277447012.

It can be divided in two parts, 387 and 1945, that added together give a palindrome (2332).

The spelling of 3871945 in words is "three million, eight hundred seventy-one thousand, nine hundred forty-five".