1217018872 has 32 divisors (see below), whose sum is σ = 2463242400. Its totient is φ = 561979264.

The previous prime is 1217018861. The next prime is 1217018879. The reversal of 1217018872 is 2788107121.

It is a super-2 number, since 2×1217018872² = 2962269869608304768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217018879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108703 + ... + 119374.

It is an arithmetic number, because the mean of its divisors is an integer number (76976325).

Almost surely, 2^1217018872 is an apocalyptic number.

It is an amenable number.

1217018872 is an abundant number, since it is smaller than the sum of its proper divisors (1246223528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1217018872 is a wasteful number, since it uses less digits than its factorization.

1217018872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228135 (or 228131 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 37.

The square root of 1217018872 is about 34885.7975686382. The cubic root of 1217018872 is about 1067.6586858856.

The spelling of 1217018872 in words is "one billion, two hundred seventeen million, eighteen thousand, eight hundred seventy-two".