1299538800 has 540 divisors, whose sum is σ = 5383483560. Its totient is φ = 289336320.

The previous prime is 1299538783. The next prime is 1299538841. The reversal of 1299538800 is 88359921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 9349131 + ... + 9349269.

It is an arithmetic number, because the mean of its divisors is an integer number (9969414).

Almost surely, 2^1299538800 is an apocalyptic number.

1299538800 is a gapful number since it is divisible by the number (10) 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 1299538800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2691741780).

1299538800 is an abundant number, since it is smaller than the sum of its proper divisors (4083944760).

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

1299538800 is a wasteful number, since it uses less digits than its factorization.

1299538800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1299538800 is about 36049.1164940280. The cubic root of 1299538800 is about 1091.2638035909.

The spelling of 1299538800 in words is "one billion, two hundred ninety-nine million, five hundred thirty-eight thousand, eight hundred".