7145809 has 4 divisors (see below), whose sum is σ = 7795440. Its totient is φ = 6496180.

The previous prime is 7145759. The next prime is 7145813. The reversal of 7145809 is 9085417.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9085417 = 11 ⋅825947.

It is a cyclic number.

It is not a de Polignac number, because 7145809 - 2⁷ = 7145681 is a prime.

It is a Duffinian number.

7145809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7145819) 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, 324799 + ... + 324820.

It is an arithmetic number, because the mean of its divisors is an integer number (1948860).

Almost surely, 2^7145809 is an apocalyptic number.

It is an amenable number.

7145809 is a deficient number, since it is larger than the sum of its proper divisors (649631).

7145809 is a wasteful number, since it uses less digits than its factorization.

7145809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649630.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 7145809 is about 2673.1646039853. The cubic root of 7145809 is about 192.6122042209.

The spelling of 7145809 in words is "seven million, one hundred forty-five thousand, eight hundred nine".