3869945 has 4 divisors (see below), whose sum is σ = 4643940. Its totient is φ = 3095952.

The previous prime is 3869917. The next prime is 3869959. The reversal of 3869945 is 5499683.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2042041 + 1827904 = 1429^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 3869945 - 2⁶ = 3869881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3869896 and 3869905.

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, 386990 + ... + 386999.

It is an arithmetic number, because the mean of its divisors is an integer number (1160985).

Almost surely, 2^3869945 is an apocalyptic number.

It is an amenable number.

3869945 is a deficient number, since it is larger than the sum of its proper divisors (773995).

3869945 is an equidigital number, since it uses as much as digits as its factorization.

3869945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773994.

The product of its digits is 233280, while the sum is 44.

The square root of 3869945 is about 1967.2175782053. The cubic root of 3869945 is about 157.0007032032. Note that the first 3 decimals are identical.

The spelling of 3869945 in words is "three million, eight hundred sixty-nine thousand, nine hundred forty-five".