2003691 has 16 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 1256640.

The previous prime is 2003681. The next prime is 2003723. The reversal of 2003691 is 1963002.

It is not a de Polignac number, because 2003691 - 2⁶ = 2003627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2003611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4695 + ... + 5103.

It is an arithmetic number, because the mean of its divisors is an integer number (177120).

2^2003691 is an apocalyptic number.

2003691 is a deficient number, since it is larger than the sum of its proper divisors (830229).

2003691 is a wasteful number, since it uses less digits than its factorization.

2003691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 2003691 is about 1415.5179264142. The cubic root of 2003691 is about 126.0695635024.

Adding to 2003691 its reverse (1963002), we get a palindrome (3966693).

The spelling of 2003691 in words is "two million, three thousand, six hundred ninety-one".