4003401665 has 16 divisors (see below), whose sum is σ = 4993386048. Its totient is φ = 3078605376.

The previous prime is 4003401641. The next prime is 4003401667. The reversal of 4003401665 is 5661043004.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4003401665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4003401667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115007 + ... + 145716.

It is an arithmetic number, because the mean of its divisors is an integer number (312086628).

Almost surely, 2^4003401665 is an apocalyptic number.

It is an amenable number.

4003401665 is a deficient number, since it is larger than the sum of its proper divisors (989984383).

4003401665 is a wasteful number, since it uses less digits than its factorization.

4003401665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260848.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 4003401665 is about 63272.4400114299. The cubic root of 4003401665 is about 1587.8509083538.

Adding to 4003401665 its reverse (5661043004), we get a palindrome (9664444669).

The spelling of 4003401665 in words is "four billion, three million, four hundred one thousand, six hundred sixty-five".