1218997417 has 8 divisors (see below), whose sum is σ = 1332364320. Its totient is φ = 1106055360.

The previous prime is 1218997391. The next prime is 1218997453. The reversal of 1218997417 is 7147998121.

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 1218997417 - 2¹⁹ = 1218473129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218997477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100192 + ... + 111697.

It is an arithmetic number, because the mean of its divisors is an integer number (166545540).

Almost surely, 2^1218997417 is an apocalyptic number.

It is an amenable number.

1218997417 is a deficient number, since it is larger than the sum of its proper divisors (113366903).

1218997417 is a wasteful number, since it uses less digits than its factorization.

1218997417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212423.

The product of its digits is 254016, while the sum is 49.

The square root of 1218997417 is about 34914.1435094719. The cubic root of 1218997417 is about 1068.2369478170.

The spelling of 1218997417 in words is "one billion, two hundred eighteen million, nine hundred ninety-seven thousand, four hundred seventeen".