398146109 has 2 divisors, whose sum is σ = 398146110. Its totient is φ = 398146108.

The previous prime is 398146087. The next prime is 398146157. The reversal of 398146109 is 901641893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371911225 + 26234884 = 19285^2 + 5122^2 .

It is an emirp because it is prime and its reverse (901641893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398146109 is a prime.

It is a super-2 number, since 2×398146109² = 317040648223679762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398146009) 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, 199073054 + 199073055.

It is an arithmetic number, because the mean of its divisors is an integer number (199073055).

Almost surely, 2^398146109 is an apocalyptic number.

It is an amenable number.

398146109 is a deficient number, since it is larger than the sum of its proper divisors (1).

398146109 is an equidigital number, since it uses as much as digits as its factorization.

398146109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 398146109 is about 19953.5988984444. The cubic root of 398146109 is about 735.6662378112. Note that the first 3 decimals are identical.

The spelling of 398146109 in words is "three hundred ninety-eight million, one hundred forty-six thousand, one hundred nine".