400380727 has 2 divisors, whose sum is σ = 400380728. Its totient is φ = 400380726.

The previous prime is 400380707. The next prime is 400380751. The reversal of 400380727 is 727083004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400380727 - 2⁷ = 400380599 is a prime.

It is equal to p_21355546 and since 400380727 and 21355546 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400380707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200190363 + 200190364.

It is an arithmetic number, because the mean of its divisors is an integer number (200190364).

Almost surely, 2^400380727 is an apocalyptic number.

400380727 is a deficient number, since it is larger than the sum of its proper divisors (1).

400380727 is an equidigital number, since it uses as much as digits as its factorization.

400380727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 400380727 is about 20009.5159111859. The cubic root of 400380727 is about 737.0399939757.

The spelling of 400380727 in words is "four hundred million, three hundred eighty thousand, seven hundred twenty-seven".