400243339 has 2 divisors, whose sum is σ = 400243340. Its totient is φ = 400243338.

The previous prime is 400243331. The next prime is 400243351. The reversal of 400243339 is 933342004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400243339 - 2³ = 400243331 is a prime.

It is not a weakly prime, because it can be changed into another prime (400243331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200121669 + 200121670.

It is an arithmetic number, because the mean of its divisors is an integer number (200121670).

Almost surely, 2^400243339 is an apocalyptic number.

400243339 is a deficient number, since it is larger than the sum of its proper divisors (1).

400243339 is an equidigital number, since it uses as much as digits as its factorization.

400243339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 400243339 is about 20006.0825500646. The cubic root of 400243339 is about 736.9556808638.

The spelling of 400243339 in words is "four hundred million, two hundred forty-three thousand, three hundred thirty-nine".