3991277 has 4 divisors (see below), whose sum is σ = 4226076. Its totient is φ = 3756480.

The previous prime is 3991261. The next prime is 3991279. The reversal of 3991277 is 7721993.

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 1833316 + 2157961 = 1354^2 + 1469^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991277 - 2⁴ = 3991261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991279) 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, 117374 + ... + 117407.

It is an arithmetic number, because the mean of its divisors is an integer number (1056519).

Almost surely, 2^3991277 is an apocalyptic number.

It is an amenable number.

3991277 is a deficient number, since it is larger than the sum of its proper divisors (234799).

3991277 is a wasteful number, since it uses less digits than its factorization.

3991277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234798.

The product of its digits is 23814, while the sum is 38.

The square root of 3991277 is about 1997.8180597842. The cubic root of 3991277 is about 158.6246303874.

The spelling of 3991277 in words is "three million, nine hundred ninety-one thousand, two hundred seventy-seven".