1299999 has 8 divisors (see below), whose sum is σ = 1824640. Its totient is φ = 821016.

The previous prime is 1299989. The next prime is 1300021. The reversal of 1299999 is 9999921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1299999 - 2⁸ = 1299743 is a prime.

It is a Duffinian number.

1299999 is a modest number, since divided by 9999 gives 129 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11347 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (228080).

2^1299999 is an apocalyptic number.

1299999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1299999 is a deficient number, since it is larger than the sum of its proper divisors (524641).

1299999 is a wasteful number, since it uses less digits than its factorization.

1299999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22829.

The product of its digits is 118098, while the sum is 48.

The square root of 1299999 is about 1140.1749865700. The cubic root of 1299999 is about 109.1392603217.

The spelling of 1299999 in words is "one million, two hundred ninety-nine thousand, nine hundred ninety-nine".