1291910472 has 224 divisors, whose sum is σ = 3895452000. Its totient is φ = 400308480.

The previous prime is 1291910467. The next prime is 1291910507. The reversal of 1291910472 is 2740191921.

1291910472 is a `hidden beast` number, since 12 + 91 + 91 + 0 + 472 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 9861847 + ... + 9861977.

Almost surely, 2^1291910472 is an apocalyptic number.

1291910472 is a gapful number since it is divisible by the number (12) 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 1291910472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947726000).

1291910472 is an abundant number, since it is smaller than the sum of its proper divisors (2603541528).

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

1291910472 is a wasteful number, since it uses less digits than its factorization.

1291910472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 244 counting only the distinct ones).

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

The square root of 1291910472 is about 35943.1561218544. The cubic root of 1291910472 is about 1089.1243625476.

The spelling of 1291910472 in words is "one billion, two hundred ninety-one million, nine hundred ten thousand, four hundred seventy-two".