398878097441 has 2 divisors, whose sum is σ = 398878097442. Its totient is φ = 398878097440.

The previous prime is 398878097419. The next prime is 398878097447. The reversal of 398878097441 is 144790878893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398748046225 + 130051216 = 631465^2 + 11404^2 .

It is an emirp because it is prime and its reverse (144790878893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398878097441 is a prime.

It is not a weakly prime, because it can be changed into another prime (398878097447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199439048720 + 199439048721.

It is an arithmetic number, because the mean of its divisors is an integer number (199439048721).

Almost surely, 2^398878097441 is an apocalyptic number.

It is an amenable number.

398878097441 is a deficient number, since it is larger than the sum of its proper divisors (1).

398878097441 is an equidigital number, since it uses as much as digits as its factorization.

398878097441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 398878097441 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, ninety-seven thousand, four hundred forty-one".