1299719340 has 72 divisors (see below), whose sum is σ = 3948824880. Its totient is φ = 346034304.

The previous prime is 1299719279. The next prime is 1299719357. The reversal of 1299719340 is 439179921.

1299719340 is a `hidden beast` number, since 1 + 299 + 7 + 19 + 340 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113142 + ... + 124098.

It is an arithmetic number, because the mean of its divisors is an integer number (54844790).

Almost surely, 2^1299719340 is an apocalyptic number.

1299719340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299719340 is an abundant number, since it is smaller than the sum of its proper divisors (2649105540).

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

1299719340 is a wasteful number, since it uses less digits than its factorization.

1299719340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11631 (or 11626 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1299719340 is about 36051.6204906243. The cubic root of 1299719340 is about 1091.3143362989.

The spelling of 1299719340 in words is "one billion, two hundred ninety-nine million, seven hundred nineteen thousand, three hundred forty".