4035991 has 4 divisors (see below), whose sum is σ = 4044232. Its totient is φ = 4027752.

The previous prime is 4035989. The next prime is 4036001. The reversal of 4035991 is 1995304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4035991 - 2¹ = 4035989 is a prime.

It is a Duffinian number.

4035991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4035191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3336 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (1011058).

Almost surely, 2^4035991 is an apocalyptic number.

4035991 is a deficient number, since it is larger than the sum of its proper divisors (8241).

4035991 is an equidigital number, since it uses as much as digits as its factorization.

4035991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8240.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 4035991 is about 2008.9776006715. The cubic root of 4035991 is about 159.2147856060.

The spelling of 4035991 in words is "four million, thirty-five thousand, nine hundred ninety-one".