7509421 has 4 divisors (see below), whose sum is σ = 7582432. Its totient is φ = 7436412.

The previous prime is 7509419. The next prime is 7509487. The reversal of 7509421 is 1249057.

It is a happy number.

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 7509421 - 2¹ = 7509419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7509421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7509401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36351 + ... + 36556.

It is an arithmetic number, because the mean of its divisors is an integer number (1895608).

Almost surely, 2^7509421 is an apocalyptic number.

It is an amenable number.

7509421 is a deficient number, since it is larger than the sum of its proper divisors (73011).

7509421 is a wasteful number, since it uses less digits than its factorization.

7509421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73010.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 7509421 is about 2740.3322791224. The cubic root of 7509421 is about 195.8253076938.

The spelling of 7509421 in words is "seven million, five hundred nine thousand, four hundred twenty-one".