3889947 has 4 divisors (see below), whose sum is σ = 5186600. Its totient is φ = 2593296.

The previous prime is 3889939. The next prime is 3889969. The reversal of 3889947 is 7499883.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3889947 - 2³ = 3889939 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3889896 and 3889905.

It is not an unprimeable number, because it can be changed into a prime (3889937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648322 + ... + 648327.

It is an arithmetic number, because the mean of its divisors is an integer number (1296650).

Almost surely, 2^3889947 is an apocalyptic number.

3889947 is a deficient number, since it is larger than the sum of its proper divisors (1296653).

3889947 is a wasteful number, since it uses less digits than its factorization.

3889947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296652.

The product of its digits is 435456, while the sum is 48.

The square root of 3889947 is about 1972.2948562525. The cubic root of 3889947 is about 157.2707271298.

The spelling of 3889947 in words is "three million, eight hundred eighty-nine thousand, nine hundred forty-seven".