1298989723 has 2 divisors, whose sum is σ = 1298989724. Its totient is φ = 1298989722.

The previous prime is 1298989717. The next prime is 1298989729. The reversal of 1298989723 is 3279898921.

It is a balanced prime because it is at equal distance from previous prime (1298989717) and next prime (1298989729).

It is a cyclic number.

It is not a de Polignac number, because 1298989723 - 2⁵ = 1298989691 is a prime.

It is the 36042-nd Hogben number.

It is not a weakly prime, because it can be changed into another prime (1298989729) by changing a digit.

It is a nontrivial repunit in base 36041.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649494861 + 649494862.

It is an arithmetic number, because the mean of its divisors is an integer number (649494862).

Almost surely, 2^1298989723 is an apocalyptic number.

1298989723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298989723 is an equidigital number, since it uses as much as digits as its factorization.

1298989723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 1298989723 is about 36041.5000104047. The cubic root of 1298989723 is about 1091.1100895029.

The spelling of 1298989723 in words is "one billion, two hundred ninety-eight million, nine hundred eighty-nine thousand, seven hundred twenty-three".