398436109 has 2 divisors, whose sum is σ = 398436110. Its totient is φ = 398436108.

The previous prime is 398436097. The next prime is 398436121. The reversal of 398436109 is 901634893.

It is a balanced prime because it is at equal distance from previous prime (398436097) and next prime (398436121).

It can be written as a sum of positive squares in only one way, i.e., 396886084 + 1550025 = 19922^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 398436109 - 2⁷ = 398435981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398436169) 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, 199218054 + 199218055.

It is an arithmetic number, because the mean of its divisors is an integer number (199218055).

Almost surely, 2^398436109 is an apocalyptic number.

It is an amenable number.

398436109 is a deficient number, since it is larger than the sum of its proper divisors (1).

398436109 is an equidigital number, since it uses as much as digits as its factorization.

398436109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 398436109 is about 19960.8644351892. The cubic root of 398436109 is about 735.8448082967.

The spelling of 398436109 in words is "three hundred ninety-eight million, four hundred thirty-six thousand, one hundred nine".