398878097399 has 2 divisors, whose sum is σ = 398878097400. Its totient is φ = 398878097398.

The previous prime is 398878097339. The next prime is 398878097407. The reversal of 398878097399 is 993790878893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398878097399 - 2²⁸ = 398609661943 is a prime.

It is a super-2 number, since 2×398878097399² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398878097339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199439048699 + 199439048700.

It is an arithmetic number, because the mean of its divisors is an integer number (199439048700).

Almost surely, 2^398878097399 is an apocalyptic number.

398878097399 is a deficient number, since it is larger than the sum of its proper divisors (1).

398878097399 is an equidigital number, since it uses as much as digits as its factorization.

398878097399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481421312, while the sum is 80.

The spelling of 398878097399 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, ninety-seven thousand, three hundred ninety-nine".