400000109 has 2 divisors, whose sum is σ = 400000110. Its totient is φ = 400000108.

The previous prime is 400000091. The next prime is 400000151. The reversal of 400000109 is 901000004.

Together with previous prime (400000091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236236900 + 163763209 = 15370^2 + 12797^2 .

It is a cyclic number.

It is not a de Polignac number, because 400000109 - 2²⁴ = 383222893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400000093 and 400000102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400000189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000054 + 200000055.

It is an arithmetic number, because the mean of its divisors is an integer number (200000055).

Almost surely, 2^400000109 is an apocalyptic number.

It is an amenable number.

400000109 is a deficient number, since it is larger than the sum of its proper divisors (1).

400000109 is an equidigital number, since it uses as much as digits as its factorization.

400000109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 400000109 is about 20000.0027249998. The cubic root of 400000109 is about 736.8063666546.

The spelling of 400000109 in words is "four hundred million, one hundred nine", and thus it is an aban number.