1217440319 has 4 divisors (see below), whose sum is σ = 1218813744. Its totient is φ = 1216066896.

The previous prime is 1217440297. The next prime is 1217440331. The reversal of 1217440319 is 9130447121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217440319 - 2²⁴ = 1200663103 is a prime.

It is a super-2 number, since 2×1217440319² = 2964321860653643522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217440349) 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, 685382 + ... + 687155.

It is an arithmetic number, because the mean of its divisors is an integer number (304703436).

Almost surely, 2^1217440319 is an apocalyptic number.

1217440319 is a deficient number, since it is larger than the sum of its proper divisors (1373425).

1217440319 is an equidigital number, since it uses as much as digits as its factorization.

1217440319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373424.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1217440319 is about 34891.8374265386. The cubic root of 1217440319 is about 1067.7819131230.

The spelling of 1217440319 in words is "one billion, two hundred seventeen million, four hundred forty thousand, three hundred nineteen".