1399289 has 4 divisors (see below), whose sum is σ = 1433460. Its totient is φ = 1365120.

The previous prime is 1399283. The next prime is 1399301. The reversal of 1399289 is 9829931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9829931 = 59 ⋅166609.

It can be written as a sum of positive squares in 2 ways, for example, as 115600 + 1283689 = 340^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399289 - 2⁴ = 1399273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 34129 = 1399289 / (1 + 3 + 9 + 9 + 2 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399283) 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 3 ways as a sum of consecutive naturals, for example, 17024 + ... + 17105.

It is an arithmetic number, because the mean of its divisors is an integer number (358365).

2^1399289 is an apocalyptic number.

It is an amenable number.

1399289 is a deficient number, since it is larger than the sum of its proper divisors (34171).

1399289 is an equidigital number, since it uses as much as digits as its factorization.

1399289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34170.

The product of its digits is 34992, while the sum is 41.

The square root of 1399289 is about 1182.9154661260. The cubic root of 1399289 is about 111.8499531957.

The spelling of 1399289 in words is "one million, three hundred ninety-nine thousand, two hundred eighty-nine".