1298128931000 has 128 divisors (see below), whose sum is σ = 3324571810560. Its totient is φ = 470508048000.

The previous prime is 1298128930979. The next prime is 1298128931027. The reversal of 1298128931000 is 1398218921.

It is a happy number.

It is a super-2 number, since 2×1298128931000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3184799 + ... + 3569201.

It is an arithmetic number, because the mean of its divisors is an integer number (25973217270).

Almost surely, 2^{1298128931000} is an apocalyptic number.

1298128931000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1298128931000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1662285905280).

1298128931000 is an abundant number, since it is smaller than the sum of its proper divisors (2026442879560).

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

1298128931000 is a wasteful number, since it uses less digits than its factorization.

1298128931000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384742 (or 384728 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The spelling of 1298128931000 in words is "one trillion, two hundred ninety-eight billion, one hundred twenty-eight million, nine hundred thirty-one thousand".