2421609 has 4 divisors (see below), whose sum is σ = 3228816. Its totient is φ = 1614404.

The previous prime is 2421593. The next prime is 2421641. The reversal of 2421609 is 9061242.

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 a cyclic number.

It is not a de Polignac number, because 2421609 - 2⁴ = 2421593 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2421649) 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, 403599 + ... + 403604.

It is an arithmetic number, because the mean of its divisors is an integer number (807204).

2^2421609 is an apocalyptic number.

It is an amenable number.

2421609 is a deficient number, since it is larger than the sum of its proper divisors (807207).

2421609 is an equidigital number, since it uses as much as digits as its factorization.

2421609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807206.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2421609 is about 1556.1519848652. The cubic root of 2421609 is about 134.2872171575.

The spelling of 2421609 in words is "two million, four hundred twenty-one thousand, six hundred nine".