3991097 has 8 divisors (see below), whose sum is σ = 4383552. Its totient is φ = 3603600.

The previous prime is 3991093. The next prime is 3991103. The reversal of 3991097 is 7901993.

It is a happy number.

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

It is not a de Polignac number, because 3991097 - 2² = 3991093 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 3991097.

It is not an unprimeable number, because it can be changed into a prime (3991093) 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 7 ways as a sum of consecutive naturals, for example, 572 + ... + 2882.

It is an arithmetic number, because the mean of its divisors is an integer number (547944).

Almost surely, 2^3991097 is an apocalyptic number.

It is an amenable number.

3991097 is a deficient number, since it is larger than the sum of its proper divisors (392455).

3991097 is a wasteful number, since it uses less digits than its factorization.

3991097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 3991097 is about 1997.7730101290. The cubic root of 3991097 is about 158.6222457819.

The spelling of 3991097 in words is "three million, nine hundred ninety-one thousand, ninety-seven".