1289005 has 8 divisors (see below), whose sum is σ = 1569024. Its totient is φ = 1016400.

The previous prime is 1289003. The next prime is 1289009. The reversal of 1289005 is 5009821.

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

It is not a de Polignac number, because 1289005 - 2¹ = 1289003 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 (1289003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (196128).

2^1289005 is an apocalyptic number.

It is an amenable number.

1289005 is a deficient number, since it is larger than the sum of its proper divisors (280019).

1289005 is an equidigital number, since it uses as much as digits as its factorization.

1289005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1289005 is about 1135.3435603376. The cubic root of 1289005 is about 108.8307279215.

The spelling of 1289005 in words is "one million, two hundred eighty-nine thousand, five".