1247907978912 has 48 divisors (see below), whose sum is σ = 3743723938752. Its totient is φ = 356545136640.

The previous prime is 1247907978899. The next prime is 1247907978913. The reversal of 1247907978912 is 2198797097421.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1247907978913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928502289 + ... + 928503632.

It is an arithmetic number, because the mean of its divisors is an integer number (77994248724).

Almost surely, 2^{1247907978912} is an apocalyptic number.

1247907978912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1247907978912 is an abundant number, since it is smaller than the sum of its proper divisors (2495815959840).

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

1247907978912 is a wasteful number, since it uses less digits than its factorization.

1247907978912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857005941 (or 1857005933 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 66.

The spelling of 1247907978912 in words is "one trillion, two hundred forty-seven billion, nine hundred seven million, nine hundred seventy-eight thousand, nine hundred twelve".