398407613 has 2 divisors, whose sum is σ = 398407614. Its totient is φ = 398407612.

The previous prime is 398407609. The next prime is 398407621. The reversal of 398407613 is 316704893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398321764 + 85849 = 19958^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 398407613 - 2² = 398407609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398407663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199203806 + 199203807.

It is an arithmetic number, because the mean of its divisors is an integer number (199203807).

Almost surely, 2^398407613 is an apocalyptic number.

It is an amenable number.

398407613 is a deficient number, since it is larger than the sum of its proper divisors (1).

398407613 is an equidigital number, since it uses as much as digits as its factorization.

398407613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 398407613 is about 19960.1506256842. The cubic root of 398407613 is about 735.8272654309.

The spelling of 398407613 in words is "three hundred ninety-eight million, four hundred seven thousand, six hundred thirteen".