3991270 has 16 divisors (see below), whose sum is σ = 7432560. Its totient is φ = 1541344.

The previous prime is 3991261. The next prime is 3991279. The reversal of 3991270 is 721993.

It is an interprime number because it is at equal distance from previous prime (3991261) and next prime (3991279).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991279) 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, 6592 + ... + 7171.

It is an arithmetic number, because the mean of its divisors is an integer number (464535).

Almost surely, 2^3991270 is an apocalyptic number.

3991270 is a deficient number, since it is larger than the sum of its proper divisors (3441290).

3991270 is a wasteful number, since it uses less digits than its factorization.

3991270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 3991270 is about 1997.8163078722. The cubic root of 3991270 is about 158.6245376541.

The spelling of 3991270 in words is "three million, nine hundred ninety-one thousand, two hundred seventy".