4340639 has 2 divisors, whose sum is σ = 4340640. Its totient is φ = 4340638.

The previous prime is 4340621. The next prime is 4340641. The reversal of 4340639 is 9360434.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4340639 - 2²⁰ = 3292063 is a prime.

It is a super-2 number, since 2×4340639² = 37682293856642, which contains 22 as substring.

Together with 4340641, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₃₀₅₄₈₉ and since 4340639 and 305489 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 (4340659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2170319 + 2170320.

It is an arithmetic number, because the mean of its divisors is an integer number (2170320).

Almost surely, 2^4340639 is an apocalyptic number.

4340639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4340639 is an equidigital number, since it uses as much as digits as its factorization.

4340639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 4340639 is about 2083.4200248630. The cubic root of 4340639 is about 163.1240101622.

The spelling of 4340639 in words is "four million, three hundred forty thousand, six hundred thirty-nine".