1289139 has 8 divisors (see below), whose sum is σ = 1724112. Its totient is φ = 856800.

The previous prime is 1289129. The next prime is 1289149. The reversal of 1289139 is 9319821.

It is an interprime number because it is at equal distance from previous prime (1289129) and next prime (1289149).

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

It is not a de Polignac number, because 1289139 - 2¹³ = 1280947 is a prime.

It is a super-2 number, since 2×1289139² = 3323758722642, which contains 22 as substring.

1289139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1289129) 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, 1489 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (215514).

2^1289139 is an apocalyptic number.

1289139 is a deficient number, since it is larger than the sum of its proper divisors (434973).

1289139 is an equidigital number, since it uses as much as digits as its factorization.

1289139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317.

The product of its digits is 3888, while the sum is 33.

The square root of 1289139 is about 1135.4025717780. The cubic root of 1289139 is about 108.8344989988.

The spelling of 1289139 in words is "one million, two hundred eighty-nine thousand, one hundred thirty-nine".