1217915673 has 16 divisors (see below), whose sum is σ = 1781801280. Its totient is φ = 735344064.

The previous prime is 1217915627. The next prime is 1217915681. The reversal of 1217915673 is 3765197121.

It is not a de Polignac number, because 1217915673 - 2¹² = 1217911577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217915603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292543 + ... + 296676.

It is an arithmetic number, because the mean of its divisors is an integer number (111362580).

Almost surely, 2^1217915673 is an apocalyptic number.

1217915673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1217915673 is a deficient number, since it is larger than the sum of its proper divisors (563885607).

1217915673 is a wasteful number, since it uses less digits than its factorization.

1217915673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589288.

The product of its digits is 79380, while the sum is 42.

The square root of 1217915673 is about 34898.6485841501. The cubic root of 1217915673 is about 1067.9208681498.

The spelling of 1217915673 in words is "one billion, two hundred seventeen million, nine hundred fifteen thousand, six hundred seventy-three".