3911855 has 4 divisors (see below), whose sum is σ = 4694232. Its totient is φ = 3129480.

The previous prime is 3911849. The next prime is 3911861. The reversal of 3911855 is 5581193.

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

It is an interprime number because it is at equal distance from previous prime (3911849) and next prime (3911861).

It is a de Polignac number, because none of the positive numbers 2^k-3911855 is a prime.

It is a Duffinian number.

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, 391181 + ... + 391190.

It is an arithmetic number, because the mean of its divisors is an integer number (1173558).

Almost surely, 2^3911855 is an apocalyptic number.

3911855 is a deficient number, since it is larger than the sum of its proper divisors (782377).

3911855 is an equidigital number, since it uses as much as digits as its factorization.

3911855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782376.

The product of its digits is 5400, while the sum is 32.

The square root of 3911855 is about 1977.8409946201. The cubic root of 3911855 is about 157.5654217172.

The spelling of 3911855 in words is "three million, nine hundred eleven thousand, eight hundred fifty-five".