398480657 has 2 divisors, whose sum is σ = 398480658. Its totient is φ = 398480656.

The previous prime is 398480633. The next prime is 398480717. The reversal of 398480657 is 756084893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309197056 + 89283601 = 17584^2 + 9449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398480657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398489657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199240328 + 199240329.

It is an arithmetic number, because the mean of its divisors is an integer number (199240329).

Almost surely, 2^398480657 is an apocalyptic number.

It is an amenable number.

398480657 is a deficient number, since it is larger than the sum of its proper divisors (1).

398480657 is an equidigital number, since it uses as much as digits as its factorization.

398480657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 398480657 is about 19961.9802875366. The cubic root of 398480657 is about 735.8722315081.

The spelling of 398480657 in words is "three hundred ninety-eight million, four hundred eighty thousand, six hundred fifty-seven".