3991294 has 16 divisors (see below), whose sum is σ = 6415200. Its totient is φ = 1855744.

The previous prime is 3991289. The next prime is 3991297. The reversal of 3991294 is 4921993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991297) 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, 2367 + ... + 3685.

It is an arithmetic number, because the mean of its divisors is an integer number (400950).

Almost surely, 2^3991294 is an apocalyptic number.

3991294 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

3991294 is a deficient number, since it is larger than the sum of its proper divisors (2423906).

3991294 is a wasteful number, since it uses less digits than its factorization.

3991294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its digits is 17496, while the sum is 37.

The square root of 3991294 is about 1997.8223144214. The cubic root of 3991294 is about 158.6248555964.

The spelling of 3991294 in words is "three million, nine hundred ninety-one thousand, two hundred ninety-four".