2002391 has 4 divisors (see below), whose sum is σ = 2107800. Its totient is φ = 1896984.

The previous prime is 2002387. The next prime is 2002397. The reversal of 2002391 is 1932002.

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 2002391 - 2² = 2002387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002397) 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, 52676 + ... + 52713.

It is an arithmetic number, because the mean of its divisors is an integer number (526950).

2^2002391 is an apocalyptic number.

2002391 is a deficient number, since it is larger than the sum of its proper divisors (105409).

2002391 is a wasteful number, since it uses less digits than its factorization.

2002391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105408.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2002391 is about 1415.0586560281. The cubic root of 2002391 is about 126.0422928488.

Adding to 2002391 its reverse (1932002), we get a palindrome (3934393).

The spelling of 2002391 in words is "two million, two thousand, three hundred ninety-one".