1215717960 has 32 divisors (see below), whose sum is σ = 3647154240. Its totient is φ = 324191424.

The previous prime is 1215717949. The next prime is 1215717967. The reversal of 1215717960 is 697175121.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1215717967) 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, 5065372 + ... + 5065611.

It is an arithmetic number, because the mean of its divisors is an integer number (113973570).

Almost surely, 2^1215717960 is an apocalyptic number.

1215717960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215717960 is an abundant number, since it is smaller than the sum of its proper divisors (2431436280).

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

1215717960 is a wasteful number, since it uses less digits than its factorization.

1215717960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10130997 (or 10130993 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 39.

The square root of 1215717960 is about 34867.1472879557. The cubic root of 1215717960 is about 1067.2781316166.

The spelling of 1215717960 in words is "one billion, two hundred fifteen million, seven hundred seventeen thousand, nine hundred sixty".