3897847 has 4 divisors (see below), whose sum is σ = 4023616. Its totient is φ = 3772080.

The previous prime is 3897841. The next prime is 3897853. The reversal of 3897847 is 7487983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7487983 = 1657 ⋅4519.

It is an interprime number because it is at equal distance from previous prime (3897841) and next prime (3897853).

It is not a de Polignac number, because 3897847 - 2¹¹ = 3895799 is a prime.

It is a super-2 number, since 2×3897847² = 30386422470818, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 3897797 and 3897806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62838 + ... + 62899.

It is an arithmetic number, because the mean of its divisors is an integer number (1005904).

Almost surely, 2^3897847 is an apocalyptic number.

3897847 is a deficient number, since it is larger than the sum of its proper divisors (125769).

3897847 is a wasteful number, since it uses less digits than its factorization.

3897847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125768.

The product of its digits is 338688, while the sum is 46.

The square root of 3897847 is about 1974.2965835963. The cubic root of 3897847 is about 157.3771209198.

The spelling of 3897847 in words is "three million, eight hundred ninety-seven thousand, eight hundred forty-seven".