3991173 has 8 divisors (see below), whose sum is σ = 5412000. Its totient is φ = 2615568.

The previous prime is 3991139. The next prime is 3991181. The reversal of 3991173 is 3711993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3991173 - 2¹² = 3987077 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11098 + ... + 11451.

It is an arithmetic number, because the mean of its divisors is an integer number (676500).

Almost surely, 2^3991173 is an apocalyptic number.

It is an amenable number.

3991173 is a deficient number, since it is larger than the sum of its proper divisors (1420827).

3991173 is a wasteful number, since it uses less digits than its factorization.

3991173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22611.

The product of its digits is 5103, while the sum is 33.

The square root of 3991173 is about 1997.7920312185. The cubic root of 3991173 is about 158.6232526241.

The spelling of 3991173 in words is "three million, nine hundred ninety-one thousand, one hundred seventy-three".