40123439 has 2 divisors, whose sum is σ = 40123440. Its totient is φ = 40123438.

The previous prime is 40123411. The next prime is 40123441. The reversal of 40123439 is 93432104.

40123439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40123439 - 2⁸ = 40123183 is a prime.

Together with 40123441, 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 (40123409) 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, 20061719 + 20061720.

It is an arithmetic number, because the mean of its divisors is an integer number (20061720).

Almost surely, 2^40123439 is an apocalyptic number.

40123439 is a deficient number, since it is larger than the sum of its proper divisors (1).

40123439 is an equidigital number, since it uses as much as digits as its factorization.

40123439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 40123439 is about 6334.3065129499. The cubic root of 40123439 is about 342.3466242779.

The spelling of 40123439 in words is "forty million, one hundred twenty-three thousand, four hundred thirty-nine".