3889945 has 4 divisors (see below), whose sum is σ = 4667940. Its totient is φ = 3111952.

The previous prime is 3889939. The next prime is 3889969. The reversal of 3889945 is 5499883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5499883 = 1051 ⋅5233.

It can be written as a sum of positive squares in 2 ways, for example, as 1893376 + 1996569 = 1376^2 + 1413^2 .

It is a cyclic number.

It is not a de Polignac number, because 3889945 - 2³ = 3889937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3889895 and 3889904.

It is an unprimeable number.

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, 388990 + ... + 388999.

It is an arithmetic number, because the mean of its divisors is an integer number (1166985).

Almost surely, 2^3889945 is an apocalyptic number.

It is an amenable number.

3889945 is a deficient number, since it is larger than the sum of its proper divisors (777995).

3889945 is an equidigital number, since it uses as much as digits as its factorization.

3889945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777994.

The product of its digits is 311040, while the sum is 46.

The square root of 3889945 is about 1972.2943492288. The cubic root of 3889945 is about 157.2707001765.

The spelling of 3889945 in words is "three million, eight hundred eighty-nine thousand, nine hundred forty-five".