400000067 has 2 divisors, whose sum is σ = 400000068. Its totient is φ = 400000066.

The previous prime is 400000049. The next prime is 400000079. The reversal of 400000067 is 760000004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400000067 - 2²² = 395805763 is a prime.

It is not a weakly prime, because it can be changed into another prime (400002067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000033 + 200000034.

It is an arithmetic number, because the mean of its divisors is an integer number (200000034).

Almost surely, 2^400000067 is an apocalyptic number.

400000067 is a deficient number, since it is larger than the sum of its proper divisors (1).

400000067 is an equidigital number, since it uses as much as digits as its factorization.

400000067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 400000067 is about 20000.0016749999. The cubic root of 400000067 is about 736.8063408664.

The spelling of 400000067 in words is "four hundred million, sixty-seven", and thus it is an aban number.