3891538 has 32 divisors (see below), whose sum is σ = 7185024. Its totient is φ = 1542912.

The previous prime is 3891527. The next prime is 3891541. The reversal of 3891538 is 8351983.

3891538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3891497 and 3891506.

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 15 ways as a sum of consecutive naturals, for example, 19656 + ... + 19852.

It is an arithmetic number, because the mean of its divisors is an integer number (224532).

Almost surely, 2^3891538 is an apocalyptic number.

3891538 is a deficient number, since it is larger than the sum of its proper divisors (3293486).

3891538 is a wasteful number, since it uses less digits than its factorization.

3891538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306.

The product of its digits is 25920, while the sum is 37.

The square root of 3891538 is about 1972.6981522777. The cubic root of 3891538 is about 157.2921656071.

The spelling of 3891538 in words is "three million, eight hundred ninety-one thousand, five hundred thirty-eight".