398134907 has 2 divisors, whose sum is σ = 398134908. Its totient is φ = 398134906.

The previous prime is 398134897. The next prime is 398134931. The reversal of 398134907 is 709431893.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398134907 is a prime.

It is a super-2 number, since 2×398134907² = 317022808343797298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398134937) 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, 199067453 + 199067454.

It is an arithmetic number, because the mean of its divisors is an integer number (199067454).

Almost surely, 2^398134907 is an apocalyptic number.

398134907 is a deficient number, since it is larger than the sum of its proper divisors (1).

398134907 is an equidigital number, since it uses as much as digits as its factorization.

398134907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 398134907 is about 19953.3181952276. The cubic root of 398134907 is about 735.6593383252.

The spelling of 398134907 in words is "three hundred ninety-eight million, one hundred thirty-four thousand, nine hundred seven".