398496121 has 2 divisors, whose sum is σ = 398496122. Its totient is φ = 398496120.

The previous prime is 398496073. The next prime is 398496149. The reversal of 398496121 is 121694893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361760400 + 36735721 = 19020^2 + 6061^2 .

It is an emirp because it is prime and its reverse (121694893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398496121 - 2⁹ = 398495609 is a prime.

It is not a weakly prime, because it can be changed into another prime (398496191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199248060 + 199248061.

It is an arithmetic number, because the mean of its divisors is an integer number (199248061).

Almost surely, 2^398496121 is an apocalyptic number.

It is an amenable number.

398496121 is a deficient number, since it is larger than the sum of its proper divisors (1).

398496121 is an equidigital number, since it uses as much as digits as its factorization.

398496121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 398496121 is about 19962.3676200996. The cubic root of 398496121 is about 735.8817504820.

The spelling of 398496121 in words is "three hundred ninety-eight million, four hundred ninety-six thousand, one hundred twenty-one".