400128727 has 2 divisors, whose sum is σ = 400128728. Its totient is φ = 400128726.

The previous prime is 400128721. The next prime is 400128731. The reversal of 400128727 is 727821004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400128727 - 2¹¹ = 400126679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400128721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200064363 + 200064364.

It is an arithmetic number, because the mean of its divisors is an integer number (200064364).

Almost surely, 2^400128727 is an apocalyptic number.

400128727 is a deficient number, since it is larger than the sum of its proper divisors (1).

400128727 is an equidigital number, since it uses as much as digits as its factorization.

400128727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 400128727 is about 20003.2179161254. The cubic root of 400128727 is about 736.8853303047.

The spelling of 400128727 in words is "four hundred million, one hundred twenty-eight thousand, seven hundred twenty-seven".