3977945 has 4 divisors (see below), whose sum is σ = 4773540. Its totient is φ = 3182352.

The previous prime is 3977933. The next prime is 3977947. The reversal of 3977945 is 5497793.

It is a happy number.

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 978121 + 2999824 = 989^2 + 1732^2 .

It is a cyclic number.

It is not a de Polignac number, because 3977945 - 2⁴ = 3977929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3977896 and 3977905.

It is not an unprimeable number, because it can be changed into a prime (3977947) 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, 397790 + ... + 397799.

It is an arithmetic number, because the mean of its divisors is an integer number (1193385).

Almost surely, 2^3977945 is an apocalyptic number.

It is an amenable number.

3977945 is a deficient number, since it is larger than the sum of its proper divisors (795595).

3977945 is an equidigital number, since it uses as much as digits as its factorization.

3977945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795594.

The product of its digits is 238140, while the sum is 44.

The square root of 3977945 is about 1994.4786286145. The cubic root of 3977945 is about 158.4478162490.

The spelling of 3977945 in words is "three million, nine hundred seventy-seven thousand, nine hundred forty-five".