1215395240240 has 80 divisors (see below), whose sum is σ = 2856020747616. Its totient is φ = 480965376000.

The previous prime is 1215395240239. The next prime is 1215395240261. The reversal of 1215395240240 is 420425935121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1215395240194 and 1215395240203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10308020 + ... + 10425260.

Almost surely, 2^{1215395240240} is an apocalyptic number.

1215395240240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215395240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428010373808).

1215395240240 is an abundant number, since it is smaller than the sum of its proper divisors (1640625507376).

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

1215395240240 is a wasteful number, since it uses less digits than its factorization.

1215395240240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118638 (or 118632 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 1215395240240 in words is "one trillion, two hundred fifteen billion, three hundred ninety-five million, two hundred forty thousand, two hundred forty".