7421409 has 8 divisors (see below), whose sum is σ = 10994720. Its totient is φ = 4947588.

The previous prime is 7421383. The next prime is 7421437. The reversal of 7421409 is 9041247.

It is a happy number.

It is not a de Polignac number, because 7421409 - 2¹² = 7417313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 274867 = 7421409 / (7 + 4 + 2 + 1 + 4 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7421489) 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 7 ways as a sum of consecutive naturals, for example, 137407 + ... + 137460.

It is an arithmetic number, because the mean of its divisors is an integer number (1374340).

Almost surely, 2^7421409 is an apocalyptic number.

It is an amenable number.

7421409 is a deficient number, since it is larger than the sum of its proper divisors (3573311).

7421409 is a wasteful number, since it uses less digits than its factorization.

7421409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274876 (or 274870 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 7421409 is about 2724.2263121848. The cubic root of 7421409 is about 195.0572612902.

The spelling of 7421409 in words is "seven million, four hundred twenty-one thousand, four hundred nine".