3897867 has 4 divisors (see below), whose sum is σ = 5197160. Its totient is φ = 2598576.

The previous prime is 3897853. The next prime is 3897871. The reversal of 3897867 is 7687983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7687983 = 3 ⋅2562661.

It is not a de Polignac number, because 3897867 - 2⁷ = 3897739 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3897827) 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 3 ways as a sum of consecutive naturals, for example, 649642 + ... + 649647.

It is an arithmetic number, because the mean of its divisors is an integer number (1299290).

Almost surely, 2^3897867 is an apocalyptic number.

3897867 is a deficient number, since it is larger than the sum of its proper divisors (1299293).

3897867 is a wasteful number, since it uses less digits than its factorization.

3897867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299292.

The product of its digits is 508032, while the sum is 48.

The square root of 3897867 is about 1974.3016486849. The cubic root of 3897867 is about 157.3773900887.

It can be divided in two parts, 389 and 7867, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 3897867 in words is "three million, eight hundred ninety-seven thousand, eight hundred sixty-seven".