4001001 has 16 divisors (see below), whose sum is σ = 5947200. Its totient is φ = 2377728.

The previous prime is 4000993. The next prime is 4001003. The reversal of 4001001 is 1001004.

It is not a de Polignac number, because 4001001 - 2³ = 4000993 is a prime.

4001001 is a modest number, since divided by 1001 gives 4 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4001003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096 + ... + 3033.

It is an arithmetic number, because the mean of its divisors is an integer number (371700).

Almost surely, 2^4001001 is an apocalyptic number.

It is an amenable number.

4001001 is a deficient number, since it is larger than the sum of its proper divisors (1946199).

4001001 is a wasteful number, since it uses less digits than its factorization.

4001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 4001001 is about 2000.2502343457. The cubic root of 4001001 is about 158.7533456628.

Adding to 4001001 its reverse (1001004), we get a palindrome (5002005).

The spelling of 4001001 in words is "four million, one thousand, one".