3847945 has 4 divisors (see below), whose sum is σ = 4617540. Its totient is φ = 3078352.

The previous prime is 3847939. The next prime is 3848017. The reversal of 3847945 is 5497483.

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 2199289 + 1648656 = 1483^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 3847945 - 2⁷ = 3847817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3847898 and 3847907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384790 + ... + 384799.

It is an arithmetic number, because the mean of its divisors is an integer number (1154385).

Almost surely, 2^3847945 is an apocalyptic number.

It is an amenable number.

3847945 is a deficient number, since it is larger than the sum of its proper divisors (769595).

3847945 is an equidigital number, since it uses as much as digits as its factorization.

3847945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769594.

The product of its digits is 120960, while the sum is 40.

The square root of 3847945 is about 1961.6179546487. The cubic root of 3847945 is about 156.7026299412.

The spelling of 3847945 in words is "three million, eight hundred forty-seven thousand, nine hundred forty-five".