398121481 has 2 divisors, whose sum is σ = 398121482. Its totient is φ = 398121480.

The previous prime is 398121473. The next prime is 398121523. The reversal of 398121481 is 184121893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342842256 + 55279225 = 18516^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 398121481 - 2³ = 398121473 is a prime.

It is a super-2 number, since 2×398121481² = 317001427267266722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398121481.

It is not a weakly prime, because it can be changed into another prime (398121431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199060740 + 199060741.

It is an arithmetic number, because the mean of its divisors is an integer number (199060741).

Almost surely, 2^398121481 is an apocalyptic number.

It is an amenable number.

398121481 is a deficient number, since it is larger than the sum of its proper divisors (1).

398121481 is an equidigital number, since it uses as much as digits as its factorization.

398121481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 37.

The square root of 398121481 is about 19952.9817571209. The cubic root of 398121481 is about 735.6510688726.

The spelling of 398121481 in words is "three hundred ninety-eight million, one hundred twenty-one thousand, four hundred eighty-one".