1217384379 has 12 divisors (see below), whose sum is σ = 1771096600. Its totient is φ = 805749984.

The previous prime is 1217384351. The next prime is 1217384383. The reversal of 1217384379 is 9734837121.

It is not a de Polignac number, because 1217384379 - 2¹⁷ = 1217253307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217384339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485314 + ... + 487815.

Almost surely, 2^1217384379 is an apocalyptic number.

1217384379 is a deficient number, since it is larger than the sum of its proper divisors (553712221).

1217384379 is a wasteful number, since it uses less digits than its factorization.

1217384379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973274 (or 973271 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 1217384379 is about 34891.0357971786. The cubic root of 1217384379 is about 1067.7655584171.

The spelling of 1217384379 in words is "one billion, two hundred seventeen million, three hundred eighty-four thousand, three hundred seventy-nine".