1299005 has 4 divisors (see below), whose sum is σ = 1558812. Its totient is φ = 1039200.

The previous prime is 1298989. The next prime is 1299007. The reversal of 1299005 is 5009921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 811801 + 487204 = 901^2 + 698^2 .

It is not a de Polignac number, because 1299005 - 2⁴ = 1298989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299007) 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, 129896 + ... + 129905.

It is an arithmetic number, because the mean of its divisors is an integer number (389703).

2^1299005 is an apocalyptic number.

It is an amenable number.

1299005 is a deficient number, since it is larger than the sum of its proper divisors (259807).

1299005 is an equidigital number, since it uses as much as digits as its factorization.

1299005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259806.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 1299005 is about 1139.7390052113. The cubic root of 1299005 is about 109.1114366884. Note that the first 3 decimals are identical.

The spelling of 1299005 in words is "one million, two hundred ninety-nine thousand, five".