73909409 has 4 divisors (see below), whose sum is σ = 84467904. Its totient is φ = 63350916.

The previous prime is 73909403. The next prime is 73909439. The reversal of 73909409 is 90490937.

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 73909409 - 2¹² = 73905313 is a prime.

It is a super-3 number, since 3×73909409³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73909403) 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, 5279237 + ... + 5279250.

It is an arithmetic number, because the mean of its divisors is an integer number (21116976).

Almost surely, 2^73909409 is an apocalyptic number.

It is an amenable number.

73909409 is a deficient number, since it is larger than the sum of its proper divisors (10558495).

73909409 is a wasteful number, since it uses less digits than its factorization.

73909409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558494.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 73909409 is about 8597.0581596265. The cubic root of 73909409 is about 419.6622549285.

The spelling of 73909409 in words is "seventy-three million, nine hundred nine thousand, four hundred nine".