1284720974138 has 32 divisors (see below), whose sum is σ = 2213724090240. Its totient is φ = 547764235200.

The previous prime is 1284720974123. The next prime is 1284720974161. The reversal of 1284720974138 is 8314790274821.

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, 2396645 + ... + 2883287.

It is an arithmetic number, because the mean of its divisors is an integer number (69178877820).

Almost surely, 2^{1284720974138} is an apocalyptic number.

1284720974138 is a deficient number, since it is larger than the sum of its proper divisors (929003116102).

1284720974138 is a wasteful number, since it uses less digits than its factorization.

1284720974138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487622.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 1284720974138 in words is "one trillion, two hundred eighty-four billion, seven hundred twenty million, nine hundred seventy-four thousand, one hundred thirty-eight".