1299104640 has 192 divisors, whose sum is σ = 4750209360. Its totient is φ = 326025216.

The previous prime is 1299104633. The next prime is 1299104641. The reversal of 1299104640 is 464019921.

It is a happy number.

1299104640 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 1 + 0 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a junction number, because it is equal to n+sod(n) for n = 1299104595 and 1299104604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299104641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91287 + ... + 104553.

Almost surely, 2^1299104640 is an apocalyptic number.

1299104640 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 1299104640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2375104680).

1299104640 is an abundant number, since it is smaller than the sum of its proper divisors (3451104720).

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

1299104640 is a wasteful number, since it uses less digits than its factorization.

1299104640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13309 (or 13294 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1299104640 is about 36043.0942067964. The cubic root of 1299104640 is about 1091.1422640969.

The spelling of 1299104640 in words is "one billion, two hundred ninety-nine million, one hundred four thousand, six hundred forty".