1298011640 has 32 divisors (see below), whose sum is σ = 2933642880. Its totient is φ = 516872832.

The previous prime is 1298011639. The next prime is 1298011669. The reversal of 1298011640 is 461108921.

It is a junction number, because it is equal to n+sod(n) for n = 1298011597 and 1298011606.

It is a congruent number.

It is an unprimeable number.

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, 63839 + ... + 81678.

It is an arithmetic number, because the mean of its divisors is an integer number (91676340).

Almost surely, 2^1298011640 is an apocalyptic number.

1298011640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1298011640 is an abundant number, since it is smaller than the sum of its proper divisors (1635631240).

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

1298011640 is a wasteful number, since it uses less digits than its factorization.

1298011640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145751 (or 145747 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1298011640 is about 36027.9286110095. The cubic root of 1298011640 is about 1090.8361678612.

The spelling of 1298011640 in words is "one billion, two hundred ninety-eight million, eleven thousand, six hundred forty".