1238307784855 has 4 divisors (see below), whose sum is σ = 1485969341832. Its totient is φ = 990646227880.

The previous prime is 1238307784837. The next prime is 1238307784921. The reversal of 1238307784855 is 5584877038321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1238307784855 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1238307784793 and 1238307784802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123830778481 + ... + 123830778490.

It is an arithmetic number, because the mean of its divisors is an integer number (371492335458).

Almost surely, 2^{1238307784855} is an apocalyptic number.

1238307784855 is a deficient number, since it is larger than the sum of its proper divisors (247661556977).

1238307784855 is an equidigital number, since it uses as much as digits as its factorization.

1238307784855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247661556976.

The product of its (nonzero) digits is 45158400, while the sum is 61.

The spelling of 1238307784855 in words is "one trillion, two hundred thirty-eight billion, three hundred seven million, seven hundred eighty-four thousand, eight hundred fifty-five".