398937019801 has 2 divisors, whose sum is σ = 398937019802. Its totient is φ = 398937019800.

The previous prime is 398937019799. The next prime is 398937019843. The reversal of 398937019801 is 108910739893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390498760201 + 8438259600 = 624899^2 + 91860^2 .

It is a cyclic number.

It is not a de Polignac number, because 398937019801 - 2¹ = 398937019799 is a prime.

Together with 398937019799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398937019001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199468509900 + 199468509901.

It is an arithmetic number, because the mean of its divisors is an integer number (199468509901).

Almost surely, 2^398937019801 is an apocalyptic number.

It is an amenable number.

398937019801 is a deficient number, since it is larger than the sum of its proper divisors (1).

398937019801 is an equidigital number, since it uses as much as digits as its factorization.

398937019801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The spelling of 398937019801 in words is "three hundred ninety-eight billion, nine hundred thirty-seven million, nineteen thousand, eight hundred one".