1215718140 has 96 divisors (see below), whose sum is σ = 4189570560. Its totient is φ = 256502016.

The previous prime is 1215718099. The next prime is 1215718157. The reversal of 1215718140 is 418175121.

1215718140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1215718098 and 1215718107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105870 + ... + 116789.

It is an arithmetic number, because the mean of its divisors is an integer number (43641360).

Almost surely, 2^1215718140 is an apocalyptic number.

1215718140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215718140 is an abundant number, since it is smaller than the sum of its proper divisors (2973852420).

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

1215718140 is a wasteful number, since it uses less digits than its factorization.

1215718140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222691 (or 222689 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 1215718140 is about 34867.1498691820. The cubic root of 1215718140 is about 1067.2781842905.

The spelling of 1215718140 in words is "one billion, two hundred fifteen million, seven hundred eighteen thousand, one hundred forty".