340440439 has 2 divisors, whose sum is σ = 340440440. Its totient is φ = 340440438.

The previous prime is 340440427. The next prime is 340440469. The reversal of 340440439 is 934044043.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340440439 - 2⁵ = 340440407 is a prime.

It is equal to p_18317209 and since 340440439 and 18317209 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340440439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340440409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170220219 + 170220220.

It is an arithmetic number, because the mean of its divisors is an integer number (170220220).

Almost surely, 2^340440439 is an apocalyptic number.

340440439 is a deficient number, since it is larger than the sum of its proper divisors (1).

340440439 is an equidigital number, since it uses as much as digits as its factorization.

340440439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 340440439 is about 18451.0281285353. The cubic root of 340440439 is about 698.2544528950.

The spelling of 340440439 in words is "three hundred forty million, four hundred forty thousand, four hundred thirty-nine".