400042339 has 2 divisors, whose sum is σ = 400042340. Its totient is φ = 400042338.

The previous prime is 400042319. The next prime is 400042369. The reversal of 400042339 is 933240004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400042339 - 2¹⁹ = 399518051 is a prime.

It is not a weakly prime, because it can be changed into another prime (400042309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200021169 + 200021170.

It is an arithmetic number, because the mean of its divisors is an integer number (200021170).

Almost surely, 2^400042339 is an apocalyptic number.

400042339 is a deficient number, since it is larger than the sum of its proper divisors (1).

400042339 is an equidigital number, since it uses as much as digits as its factorization.

400042339 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 25.

The square root of 400042339 is about 20001.0584469922. The cubic root of 400042339 is about 736.8322951792.

The spelling of 400042339 in words is "four hundred million, forty-two thousand, three hundred thirty-nine".