1215395240242 has 64 divisors (see below), whose sum is σ = 1908137088000. Its totient is φ = 579898432512.

The previous prime is 1215395240239. The next prime is 1215395240261. The reversal of 1215395240242 is 2420425935121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1215395240195 and 1215395240204.

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, 1690396359 + ... + 1690397077.

It is an arithmetic number, because the mean of its divisors is an integer number (29814642000).

Almost surely, 2^{1215395240242} is an apocalyptic number.

1215395240242 is a deficient number, since it is larger than the sum of its proper divisors (692741847758).

1215395240242 is a wasteful number, since it uses less digits than its factorization.

1215395240242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 1215395240242 in words is "one trillion, two hundred fifteen billion, three hundred ninety-five million, two hundred forty thousand, two hundred forty-two".