2002405 has 4 divisors (see below), whose sum is σ = 2402892. Its totient is φ = 1601920.

The previous prime is 2002397. The next prime is 2002417. The reversal of 2002405 is 5042002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1181569 + 820836 = 1087^2 + 906^2 .

It is not a de Polignac number, because 2002405 - 2³ = 2002397 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁷ + 0 + 0 + 2¹⁵ + 4⁷ + 0 + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 200236 + ... + 200245.

It is an arithmetic number, because the mean of its divisors is an integer number (600723).

2^2002405 is an apocalyptic number.

It is an amenable number.

2002405 is a deficient number, since it is larger than the sum of its proper divisors (400487).

2002405 is an equidigital number, since it uses as much as digits as its factorization.

2002405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400486.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 2002405 is about 1415.0636028108. The cubic root of 2002405 is about 126.0425865956.

Adding to 2002405 its reverse (5042002), we get a palindrome (7044407).

The spelling of 2002405 in words is "two million, two thousand, four hundred five".