1340247 has 8 divisors (see below), whose sum is σ = 1797120. Its totient is φ = 888440.

The previous prime is 1340243. The next prime is 1340281. The reversal of 1340247 is 7420431.

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

It is a cyclic number.

It is not a de Polignac number, because 1340247 - 2² = 1340243 is a prime.

1340247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340243) 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, 597 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (224640).

2^1340247 is an apocalyptic number.

1340247 is a deficient number, since it is larger than the sum of its proper divisors (456873).

1340247 is a wasteful number, since it uses less digits than its factorization.

1340247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1340247 is about 1157.6903731136. The cubic root of 1340247 is about 110.2541506348.

Adding to 1340247 its reverse (7420431), we get a palindrome (8760678).

The spelling of 1340247 in words is "one million, three hundred forty thousand, two hundred forty-seven".