1298989800 has 72 divisors (see below), whose sum is σ = 4362446790. Its totient is φ = 346396800.

The previous prime is 1298989789. The next prime is 1298989817. The reversal of 1298989800 is 89898921.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1140683076 + 158306724 = 33774^2 + 12582^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 359031 + ... + 362630.

Almost surely, 2^1298989800 is an apocalyptic number.

1298989800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1298989800 is an abundant number, since it is smaller than the sum of its proper divisors (3063456990).

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

1298989800 is a wasteful number, since it uses less digits than its factorization.

1298989800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721683 (or 721671 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 1298989800 is about 36041.5010786177. The cubic root of 1298989800 is about 1091.1101110621.

The spelling of 1298989800 in words is "one billion, two hundred ninety-eight million, nine hundred eighty-nine thousand, eight hundred".