2421309 has 16 divisors (see below), whose sum is σ = 3548160. Its totient is φ = 1456560.

The previous prime is 2421283. The next prime is 2421311. The reversal of 2421309 is 9031242.

It is not a de Polignac number, because 2421309 - 2⁵ = 2421277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7734 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (221760).

2^2421309 is an apocalyptic number.

It is an amenable number.

2421309 is a deficient number, since it is larger than the sum of its proper divisors (1126851).

2421309 is a wasteful number, since it uses less digits than its factorization.

2421309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2421309 is about 1556.0555902666. The cubic root of 2421309 is about 134.2816715569.

It can be divided in two parts, 242 and 1309, that added together give a palindrome (1551).

The spelling of 2421309 in words is "two million, four hundred twenty-one thousand, three hundred nine".