2900005 has 4 divisors (see below), whose sum is σ = 3480012. Its totient is φ = 2320000.

The previous prime is 2899997. The next prime is 2900017. The reversal of 2900005 is 5000092.

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 2163841 + 736164 = 1471^2 + 858^2 .

It is not a de Polignac number, because 2900005 - 2³ = 2899997 is a prime.

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289996 + ... + 290005.

It is an arithmetic number, because the mean of its divisors is an integer number (870003).

2^2900005 is an apocalyptic number.

It is an amenable number.

2900005 is a deficient number, since it is larger than the sum of its proper divisors (580007).

2900005 is an equidigital number, since it uses as much as digits as its factorization.

2900005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580006.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 2900005 is about 1702.9401046426. The cubic root of 2900005 is about 142.6043966707.

Adding to 2900005 its reverse (5000092), we get a palindrome (7900097).

The spelling of 2900005 in words is "two million, nine hundred thousand, five".