398375366401 has 4 divisors (see below), whose sum is σ = 411226184704. Its totient is φ = 385524548100.

The previous prime is 398375366399. The next prime is 398375366407. The reversal of 398375366401 is 104663573893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398375366401 - 2¹ = 398375366399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398375366407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6425409105 + ... + 6425409166.

It is an arithmetic number, because the mean of its divisors is an integer number (102806546176).

Almost surely, 2^398375366401 is an apocalyptic number.

398375366401 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

398375366401 is a deficient number, since it is larger than the sum of its proper divisors (12850818303).

398375366401 is a wasteful number, since it uses less digits than its factorization.

398375366401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850818302.

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 398375366401 in words is "three hundred ninety-eight billion, three hundred seventy-five million, three hundred sixty-six thousand, four hundred one".