1298647431918 has 32 divisors (see below), whose sum is σ = 2888523645600. Its totient is φ = 432486407808.

The previous prime is 1298647431847. The next prime is 1298647431937. The reversal of 1298647431918 is 8191347468921.

1298647431918 is a `hidden beast` number, since 129 + 8 + 6 + 474 + 31 + 9 + 1 + 8 = 666.

It is a congruent number.

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, 10942363 + ... + 11060406.

It is an arithmetic number, because the mean of its divisors is an integer number (90266363925).

Almost surely, 2^{1298647431918} is an apocalyptic number.

1298647431918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1298647431918 is an abundant number, since it is smaller than the sum of its proper divisors (1589876213682).

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

1298647431918 is a wasteful number, since it uses less digits than its factorization.

1298647431918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22003873 (or 22003867 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 1298647431918 in words is "one trillion, two hundred ninety-eight billion, six hundred forty-seven million, four hundred thirty-one thousand, nine hundred eighteen".