3964991 has 4 divisors (see below), whose sum is σ = 3969984. Its totient is φ = 3960000.

The previous prime is 3964973. The next prime is 3965021. The reversal of 3964991 is 1994693.

3964991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1994693 = 409 ⋅4877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3964991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3964951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010 + ... + 2991.

It is an arithmetic number, because the mean of its divisors is an integer number (992496).

Almost surely, 2^3964991 is an apocalyptic number.

3964991 is a deficient number, since it is larger than the sum of its proper divisors (4993).

3964991 is an equidigital number, since it uses as much as digits as its factorization.

3964991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992.

The product of its digits is 52488, while the sum is 41.

The square root of 3964991 is about 1991.2285152639. The cubic root of 3964991 is about 158.2756364724.

It can be divided in two parts, 3964 and 991, that multiplied together give a square (3928324 = 1982²).

The spelling of 3964991 in words is "three million, nine hundred sixty-four thousand, nine hundred ninety-one".