1299669620 has 24 divisors (see below), whose sum is σ = 2740641288. Its totient is φ = 517708800.

The previous prime is 1299669611. The next prime is 1299669629. The reversal of 1299669620 is 269669921.

It is an interprime number because it is at equal distance from previous prime (1299669611) and next prime (1299669629).

It can be written as a sum of positive squares in 4 ways, for example, as 418529764 + 881139856 = 20458^2 + 29684^2 .

It is a super-2 number, since 2×1299669620² = 3378282242301888800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299669629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130001 + ... + 139640.

It is an arithmetic number, because the mean of its divisors is an integer number (114193387).

Almost surely, 2^1299669620 is an apocalyptic number.

1299669620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299669620 is an abundant number, since it is smaller than the sum of its proper divisors (1440971668).

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

1299669620 is a wasteful number, since it uses less digits than its factorization.

1299669620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269891 (or 269889 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 1299669620 is about 36050.9309172454. The cubic root of 1299669620 is about 1091.3004202585.

The spelling of 1299669620 in words is "one billion, two hundred ninety-nine million, six hundred sixty-nine thousand, six hundred twenty".