1243854135215 has 8 divisors (see below), whose sum is σ = 1494031778208. Its totient is φ = 994145430880.

The previous prime is 1243854135193. The next prime is 1243854135221. The reversal of 1243854135215 is 5125314583421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243854135215 - 2²⁴ = 1243837357999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117228827 + ... + 117239436.

It is an arithmetic number, because the mean of its divisors is an integer number (186753972276).

Almost surely, 2^{1243854135215} is an apocalyptic number.

1243854135215 is a deficient number, since it is larger than the sum of its proper divisors (250177642993).

1243854135215 is a wasteful number, since it uses less digits than its factorization.

1243854135215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234469329.

The product of its digits is 576000, while the sum is 44.

The spelling of 1243854135215 in words is "one trillion, two hundred forty-three billion, eight hundred fifty-four million, one hundred thirty-five thousand, two hundred fifteen".