3977391 has 12 divisors (see below), whose sum is σ = 5829656. Its totient is φ = 2410320.

The previous prime is 3977387. The next prime is 3977401. The reversal of 3977391 is 1937793.

It is not a de Polignac number, because 3977391 - 2² = 3977387 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977341) 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 11 ways as a sum of consecutive naturals, for example, 5116 + ... + 5841.

Almost surely, 2^3977391 is an apocalyptic number.

3977391 is a deficient number, since it is larger than the sum of its proper divisors (1852265).

3977391 is a wasteful number, since it uses less digits than its factorization.

3977391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10982 (or 10971 counting only the distinct ones).

The product of its digits is 35721, while the sum is 39.

The square root of 3977391 is about 1994.3397403652. The cubic root of 3977391 is about 158.4404603433.

The spelling of 3977391 in words is "three million, nine hundred seventy-seven thousand, three hundred ninety-one".