340440407 has 2 divisors, whose sum is σ = 340440408. Its totient is φ = 340440406.

The previous prime is 340440403. The next prime is 340440409. The reversal of 340440407 is 704044043.

It is a strong prime.

It is an emirp because it is prime and its reverse (704044043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340440407 - 2² = 340440403 is a prime.

Together with 340440409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340440403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170220203 + 170220204.

It is an arithmetic number, because the mean of its divisors is an integer number (170220204).

Almost surely, 2^340440407 is an apocalyptic number.

340440407 is a deficient number, since it is larger than the sum of its proper divisors (1).

340440407 is an equidigital number, since it uses as much as digits as its factorization.

340440407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 26.

The square root of 340440407 is about 18451.0272613749. The cubic root of 340440407 is about 698.2544310174.

The spelling of 340440407 in words is "three hundred forty million, four hundred forty thousand, four hundred seven".