40347689 has 2 divisors, whose sum is σ = 40347690. Its totient is φ = 40347688.

The previous prime is 40347683. The next prime is 40347691. The reversal of 40347689 is 98674304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 20025625 = 4508^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 40347689 - 2⁴ = 40347673 is a prime.

Together with 40347691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40347683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20173844 + 20173845.

It is an arithmetic number, because the mean of its divisors is an integer number (20173845).

Almost surely, 2^40347689 is an apocalyptic number.

It is an amenable number.

40347689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40347689 is an equidigital number, since it uses as much as digits as its factorization.

40347689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 40347689 is about 6351.9830761739. The cubic root of 40347689 is about 342.9832317903.

The spelling of 40347689 in words is "forty million, three hundred forty-seven thousand, six hundred eighty-nine".