918480509 has 4 divisors (see below), whose sum is σ = 918542400. Its totient is φ = 918418620.

The previous prime is 918480499. The next prime is 918480583. The reversal of 918480509 is 905084819.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 905084819 = 1223 ⋅740053.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918480509 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 918480509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918480109) 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, 6092 + ... + 43290.

It is an arithmetic number, because the mean of its divisors is an integer number (229635600).

Almost surely, 2^918480509 is an apocalyptic number.

It is an amenable number.

918480509 is a deficient number, since it is larger than the sum of its proper divisors (61891).

918480509 is a wasteful number, since it uses less digits than its factorization.

918480509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61890.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 918480509 is about 30306.4433578076. The cubic root of 918480509 is about 972.0530818979.

The spelling of 918480509 in words is "nine hundred eighteen million, four hundred eighty thousand, five hundred nine".