3891897 has 6 divisors (see below), whose sum is σ = 5621642. Its totient is φ = 2594592.

The previous prime is 3891893. The next prime is 3891907. The reversal of 3891897 is 7981983.

It can be written as a sum of positive squares in only one way, i.e., 3884841 + 7056 = 1971^2 + 84^2 .

It is not a de Polignac number, because 3891897 - 2² = 3891893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891893) 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 5 ways as a sum of consecutive naturals, for example, 216208 + ... + 216225.

Almost surely, 2^3891897 is an apocalyptic number.

It is an amenable number.

3891897 is a deficient number, since it is larger than the sum of its proper divisors (1729745).

3891897 is a wasteful number, since it uses less digits than its factorization.

3891897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432439 (or 432436 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 3891897 is about 1972.7891423059. The cubic root of 3891897 is about 157.2970022682.

The spelling of 3891897 in words is "three million, eight hundred ninety-one thousand, eight hundred ninety-seven".