1299304840 has 16 divisors (see below), whose sum is σ = 2923435980. Its totient is φ = 519721920.

The previous prime is 1299304823. The next prime is 1299304841. The reversal of 1299304840 is 484039921.

It can be written as a sum of positive squares in 2 ways, for example, as 1218987396 + 80317444 = 34914^2 + 8962^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 32482621 = 1299304840 / (1 + 2 + 9 + 9 + 3 + 0 + 4 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1299304793 and 1299304802.

It is not an unprimeable number, because it can be changed into a prime (1299304841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16241271 + ... + 16241350.

Almost surely, 2^1299304840 is an apocalyptic number.

1299304840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299304840 is an abundant number, since it is smaller than the sum of its proper divisors (1624131140).

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

1299304840 is a wasteful number, since it uses less digits than its factorization.

1299304840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32482632 (or 32482628 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1299304840 is about 36045.8713308473. The cubic root of 1299304840 is about 1091.1983117917.

The spelling of 1299304840 in words is "one billion, two hundred ninety-nine million, three hundred four thousand, eight hundred forty".