1217718940 has 12 divisors (see below), whose sum is σ = 2557209816. Its totient is φ = 487087568.

The previous prime is 1217718919. The next prime is 1217718947. The reversal of 1217718940 is 498177121.

It is a super-3 number, since 3×1217718940³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1217718893 and 1217718902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217718947) 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, 30442954 + ... + 30442993.

It is an arithmetic number, because the mean of its divisors is an integer number (213100818).

Almost surely, 2^1217718940 is an apocalyptic number.

1217718940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217718940 is an abundant number, since it is smaller than the sum of its proper divisors (1339490876).

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

1217718940 is a wasteful number, since it uses less digits than its factorization.

1217718940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60885956 (or 60885954 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1217718940 is about 34895.8298368157. The cubic root of 1217718940 is about 1067.8633637335.

The spelling of 1217718940 in words is "one billion, two hundred seventeen million, seven hundred eighteen thousand, nine hundred forty".