1283912721858 has 64 divisors (see below), whose sum is σ = 2989568211840. Its totient is φ = 364142863872.

The previous prime is 1283912721841. The next prime is 1283912721863. The reversal of 1283912721858 is 8581272193821.

It is a super-3 number, since 3×1283912721858³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 1283912721798 and 1283912721807.

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, 11652435 + ... + 11762102.

It is an arithmetic number, because the mean of its divisors is an integer number (46712003310).

Almost surely, 2^{1283912721858} is an apocalyptic number.

1283912721858 is an abundant number, since it is smaller than the sum of its proper divisors (1705655489982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1283912721858 is a wasteful number, since it uses less digits than its factorization.

1283912721858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23414611.

The product of its digits is 3870720, while the sum is 57.

The spelling of 1283912721858 in words is "one trillion, two hundred eighty-three billion, nine hundred twelve million, seven hundred twenty-one thousand, eight hundred fifty-eight".