1340239 has 4 divisors (see below), whose sum is σ = 1342656. Its totient is φ = 1337824.

The previous prime is 1340237. The next prime is 1340243. The reversal of 1340239 is 9320431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9320431 = 19 ⋅490549.

It is a cyclic number.

It is not a de Polignac number, because 1340239 - 2¹ = 1340237 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 (1340237) 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, 87 + ... + 1639.

It is an arithmetic number, because the mean of its divisors is an integer number (335664).

2^1340239 is an apocalyptic number.

1340239 is a deficient number, since it is larger than the sum of its proper divisors (2417).

1340239 is an equidigital number, since it uses as much as digits as its factorization.

1340239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1340239 is about 1157.6869179532. The cubic root of 1340239 is about 110.2539312636.

The spelling of 1340239 in words is "one million, three hundred forty thousand, two hundred thirty-nine".