398031937 has 2 divisors, whose sum is σ = 398031938. Its totient is φ = 398031936.

The previous prime is 398031913. The next prime is 398031973. The reversal of 398031937 is 739130893.

Together with next prime (398031973) 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., 208253761 + 189778176 = 14431^2 + 13776^2 .

It is a cyclic number.

It is not a de Polignac number, because 398031937 - 2¹¹ = 398029889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398031893 and 398031902.

It is not a weakly prime, because it can be changed into another prime (398031737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199015968 + 199015969.

It is an arithmetic number, because the mean of its divisors is an integer number (199015969).

Almost surely, 2^398031937 is an apocalyptic number.

It is an amenable number.

398031937 is a deficient number, since it is larger than the sum of its proper divisors (1).

398031937 is an equidigital number, since it uses as much as digits as its factorization.

398031937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 398031937 is about 19950.7377557824. The cubic root of 398031937 is about 735.5959114380.

The spelling of 398031937 in words is "three hundred ninety-eight million, thirty-one thousand, nine hundred thirty-seven".