2509421 has 4 divisors (see below), whose sum is σ = 2657052. Its totient is φ = 2361792.

The previous prime is 2509417. The next prime is 2509427. The reversal of 2509421 is 1249052.

2509421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1653796 + 855625 = 1286^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509421 - 2² = 2509417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73790 + ... + 73823.

It is an arithmetic number, because the mean of its divisors is an integer number (664263).

2^2509421 is an apocalyptic number.

It is an amenable number.

2509421 is a deficient number, since it is larger than the sum of its proper divisors (147631).

2509421 is a wasteful number, since it uses less digits than its factorization.

2509421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147630.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2509421 is about 1584.1152104566. The cubic root of 2509421 is about 135.8911506494.

The spelling of 2509421 in words is "two million, five hundred nine thousand, four hundred twenty-one".