2905649 has 4 divisors (see below), whose sum is σ = 2925300. Its totient is φ = 2886000.

The previous prime is 2905631. The next prime is 2905667. The reversal of 2905649 is 9465092.

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

It is an interprime number because it is at equal distance from previous prime (2905631) and next prime (2905667).

It can be written as a sum of positive squares in 2 ways, for example, as 889249 + 2016400 = 943^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2905649 - 2⁸ = 2905393 is a prime.

It is a super-2 number, since 2×2905649² = 16885592222402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2905549) 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, 9602 + ... + 9899.

It is an arithmetic number, because the mean of its divisors is an integer number (731325).

2^2905649 is an apocalyptic number.

It is an amenable number.

2905649 is a deficient number, since it is larger than the sum of its proper divisors (19651).

2905649 is a wasteful number, since it uses less digits than its factorization.

2905649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19650.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2905649 is about 1704.5964331771. The cubic root of 2905649 is about 142.6968491134.

The spelling of 2905649 in words is "two million, nine hundred five thousand, six hundred forty-nine".