1291912704 has 120 divisors (see below), whose sum is σ = 3757233480. Its totient is φ = 427327488.

The previous prime is 1291912681. The next prime is 1291912709. The reversal of 1291912704 is 4072191921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291912709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639504 + ... + 641520.

It is an arithmetic number, because the mean of its divisors is an integer number (31310279).

Almost surely, 2^1291912704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291912704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878616740).

1291912704 is an abundant number, since it is smaller than the sum of its proper divisors (2465320776).

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

1291912704 is a wasteful number, since it uses less digits than its factorization.

1291912704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180 (or 2161 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1291912704 is about 35943.1871708673. The cubic root of 1291912704 is about 1089.1249897645.

The spelling of 1291912704 in words is "one billion, two hundred ninety-one million, nine hundred twelve thousand, seven hundred four".