1216430809 has 8 divisors (see below), whose sum is σ = 1336703328. Its totient is φ = 1097772960.

The previous prime is 1216430791. The next prime is 1216430851. The reversal of 1216430809 is 9080346121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216430809 - 2⁵ = 1216430777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216430879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402087 + ... + 405100.

It is an arithmetic number, because the mean of its divisors is an integer number (167087916).

Almost surely, 2^1216430809 is an apocalyptic number.

It is an amenable number.

1216430809 is a deficient number, since it is larger than the sum of its proper divisors (120272519).

1216430809 is a wasteful number, since it uses less digits than its factorization.

1216430809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807335.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1216430809 is about 34877.3681489874. The cubic root of 1216430809 is about 1067.4866941066.

The spelling of 1216430809 in words is "one billion, two hundred sixteen million, four hundred thirty thousand, eight hundred nine".