1215440402415 has 16 divisors (see below), whose sum is σ = 1966555260000. Its totient is φ = 640951342592.

The previous prime is 1215440402389. The next prime is 1215440402467. The reversal of 1215440402415 is 5142040445121.

It is a cyclic number.

It is not a de Polignac number, because 1215440402415 - 2²⁰ = 1215439353839 is a prime.

It is a congruent number.

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, 455219790 + ... + 455222459.

It is an arithmetic number, because the mean of its divisors is an integer number (122909703750).

Almost surely, 2^{1215440402415} is an apocalyptic number.

1215440402415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215440402415 is a deficient number, since it is larger than the sum of its proper divisors (751114857585).

1215440402415 is an equidigital number, since it uses as much as digits as its factorization.

1215440402415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910442346.

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 1215440402415 its reverse (5142040445121), we get a palindrome (6357480847536).

The spelling of 1215440402415 in words is "one trillion, two hundred fifteen billion, four hundred forty million, four hundred two thousand, four hundred fifteen".