398406013 has 2 divisors, whose sum is σ = 398406014. Its totient is φ = 398406012.

The previous prime is 398405993. The next prime is 398406049. The reversal of 398406013 is 310604893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319587129 + 78818884 = 17877^2 + 8878^2 .

It is a cyclic number.

It is not a de Polignac number, because 398406013 - 2¹³ = 398397821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398406013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398406313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199203006 + 199203007.

It is an arithmetic number, because the mean of its divisors is an integer number (199203007).

Almost surely, 2^398406013 is an apocalyptic number.

It is an amenable number.

398406013 is a deficient number, since it is larger than the sum of its proper divisors (1).

398406013 is an equidigital number, since it uses as much as digits as its factorization.

398406013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 398406013 is about 19960.1105457861. The cubic root of 398406013 is about 735.8262804052.

The spelling of 398406013 in words is "three hundred ninety-eight million, four hundred six thousand, thirteen".