3900191 has 4 divisors (see below), whose sum is σ = 4129632. Its totient is φ = 3670752.

The previous prime is 3900167. The next prime is 3900199. The reversal of 3900191 is 1910093.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3900191 is a prime.

It is a super-2 number, since 2×3900191² = 30422979672962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900199) 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 3 ways as a sum of consecutive naturals, for example, 114695 + ... + 114728.

It is an arithmetic number, because the mean of its divisors is an integer number (1032408).

Almost surely, 2^3900191 is an apocalyptic number.

3900191 is a deficient number, since it is larger than the sum of its proper divisors (229441).

3900191 is a wasteful number, since it uses less digits than its factorization.

3900191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229440.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 3900191 is about 1974.8901235259. The cubic root of 3900191 is about 157.4086612420.

The spelling of 3900191 in words is "three million, nine hundred thousand, one hundred ninety-one".