3977905 has 4 divisors (see below), whose sum is σ = 4773492. Its totient is φ = 3182320.

The previous prime is 3977903. The next prime is 3977921. The reversal of 3977905 is 5097793.

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 2961841 + 1016064 = 1721^2 + 1008^2 .

It is not a de Polignac number, because 3977905 - 2¹ = 3977903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3977903) 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, 397786 + ... + 397795.

It is an arithmetic number, because the mean of its divisors is an integer number (1193373).

Almost surely, 2^3977905 is an apocalyptic number.

It is an amenable number.

3977905 is a deficient number, since it is larger than the sum of its proper divisors (795587).

3977905 is an equidigital number, since it uses as much as digits as its factorization.

3977905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795586.

The product of its (nonzero) digits is 59535, while the sum is 40.

The square root of 3977905 is about 1994.4686009060. The cubic root of 3977905 is about 158.4472851596.

The spelling of 3977905 in words is "three million, nine hundred seventy-seven thousand, nine hundred five".