4005491 has 8 divisors (see below), whose sum is σ = 4593504. Its totient is φ = 3421440.

The previous prime is 4005467. The next prime is 4005499. The reversal of 4005491 is 1945004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4005491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4005499) 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, 1661 + ... + 3281.

It is an arithmetic number, because the mean of its divisors is an integer number (574188).

Almost surely, 2^4005491 is an apocalyptic number.

4005491 is a deficient number, since it is larger than the sum of its proper divisors (588013).

4005491 is a wasteful number, since it uses less digits than its factorization.

4005491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4005491 is about 2001.3722792124. The cubic root of 4005491 is about 158.8127088112.

The spelling of 4005491 in words is "four million, five thousand, four hundred ninety-one".