2405649 has 4 divisors (see below), whose sum is σ = 3207536. Its totient is φ = 1603764.

The previous prime is 2405633. The next prime is 2405651. The reversal of 2405649 is 9465042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2405649 - 2⁴ = 2405633 is a prime.

It is a super-2 number, since 2×2405649² = 11574294222402, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2405149) 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, 400939 + ... + 400944.

It is an arithmetic number, because the mean of its divisors is an integer number (801884).

2^2405649 is an apocalyptic number.

It is an amenable number.

2405649 is a deficient number, since it is larger than the sum of its proper divisors (801887).

2405649 is an equidigital number, since it uses as much as digits as its factorization.

2405649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801886.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2405649 is about 1551.0154738106. The cubic root of 2405649 is about 133.9915528944.

The spelling of 2405649 in words is "two million, four hundred five thousand, six hundred forty-nine".