1340289 has 6 divisors (see below), whose sum is σ = 1935986. Its totient is φ = 893520.

The previous prime is 1340281. The next prime is 1340291. The reversal of 1340289 is 9820431.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 173889 = 1080^2 + 417^2 .

It is not a de Polignac number, because 1340289 - 2³ = 1340281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74452 + ... + 74469.

2^1340289 is an apocalyptic number.

It is an amenable number.

1340289 is a deficient number, since it is larger than the sum of its proper divisors (595697).

1340289 is a wasteful number, since it uses less digits than its factorization.

1340289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148927 (or 148924 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1340289 is about 1157.7085125367. The cubic root of 1340289 is about 110.2553023195.

The spelling of 1340289 in words is "one million, three hundred forty thousand, two hundred eighty-nine".