340447 has 2 divisors, whose sum is σ = 340448. Its totient is φ = 340446.

The previous prime is 340429. The next prime is 340451. The reversal of 340447 is 744043.

It is a strong prime.

It is an emirp because it is prime and its reverse (744043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340447 is a prime.

It is equal to p₂₉₂₁₈ and since 340447 and 29218 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170223 + 170224.

It is an arithmetic number, because the mean of its divisors is an integer number (170224).

2³⁴⁰⁴⁴⁷ is an apocalyptic number.

340447 is a deficient number, since it is larger than the sum of its proper divisors (1).

340447 is an equidigital number, since it uses as much as digits as its factorization.

340447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 340447 is about 583.4783629236. The cubic root of 340447 is about 69.8258938475.

It can be divided in two parts, 340 and 447, that added together give a palindrome (787).

The spelling of 340447 in words is "three hundred forty thousand, four hundred forty-seven", and thus it is an iban number.