3991255 has 4 divisors (see below), whose sum is σ = 4789512. Its totient is φ = 3193000.

The previous prime is 3991237. The next prime is 3991261. The reversal of 3991255 is 5521993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3991255 - 2⁵ = 3991223 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 3991255.

It is a congruent number.

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, 399121 + ... + 399130.

It is an arithmetic number, because the mean of its divisors is an integer number (1197378).

Almost surely, 2^3991255 is an apocalyptic number.

3991255 is a deficient number, since it is larger than the sum of its proper divisors (798257).

3991255 is an equidigital number, since it uses as much as digits as its factorization.

3991255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798256.

The product of its digits is 12150, while the sum is 34.

The square root of 3991255 is about 1997.8125537697. The cubic root of 3991255 is about 158.6243389395.

The spelling of 3991255 in words is "three million, nine hundred ninety-one thousand, two hundred fifty-five".