398373137 has 2 divisors, whose sum is σ = 398373138. Its totient is φ = 398373136.

The previous prime is 398373077. The next prime is 398373139. The reversal of 398373137 is 731373893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299151616 + 99221521 = 17296^2 + 9961^2 .

It is a cyclic number.

It is not a de Polignac number, because 398373137 - 2²² = 394178833 is a prime.

Together with 398373139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398373139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199186568 + 199186569.

It is an arithmetic number, because the mean of its divisors is an integer number (199186569).

Almost surely, 2^398373137 is an apocalyptic number.

It is an amenable number.

398373137 is a deficient number, since it is larger than the sum of its proper divisors (1).

398373137 is an equidigital number, since it uses as much as digits as its factorization.

398373137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 44.

The square root of 398373137 is about 19959.2869862628. The cubic root of 398373137 is about 735.8060400060.

The spelling of 398373137 in words is "three hundred ninety-eight million, three hundred seventy-three thousand, one hundred thirty-seven".