1215718040 has 48 divisors (see below), whose sum is σ = 2886943680. Its totient is φ = 460687680.

The previous prime is 1215718037. The next prime is 1215718051. The reversal of 1215718040 is 408175121.

It is a junction number, because it is equal to n+sod(n) for n = 1215717994 and 1215718012.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 27656 + ... + 56535.

It is an arithmetic number, because the mean of its divisors is an integer number (60144660).

Almost surely, 2^1215718040 is an apocalyptic number.

1215718040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215718040 is an abundant number, since it is smaller than the sum of its proper divisors (1671225640).

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

1215718040 is a wasteful number, since it uses less digits than its factorization.

1215718040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84240 (or 84217 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1215718040 is about 34867.1484351675. The cubic root of 1215718040 is about 1067.2781550272.

The spelling of 1215718040 in words is "one billion, two hundred fifteen million, seven hundred eighteen thousand, forty".