405198881 has 2 divisors, whose sum is σ = 405198882. Its totient is φ = 405198880.

The previous prime is 405198869. The next prime is 405198901. The reversal of 405198881 is 188891504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308353600 + 96845281 = 17560^2 + 9841^2 .

It is a cyclic number.

It is not a de Polignac number, because 405198881 - 2¹⁴ = 405182497 is a prime.

It is a super-2 number, since 2×405198881² = 328372266327304322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405198181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202599440 + 202599441.

It is an arithmetic number, because the mean of its divisors is an integer number (202599441).

Almost surely, 2^405198881 is an apocalyptic number.

It is an amenable number.

405198881 is a deficient number, since it is larger than the sum of its proper divisors (1).

405198881 is an equidigital number, since it uses as much as digits as its factorization.

405198881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 405198881 is about 20129.5524292022. The cubic root of 405198881 is about 739.9847093261.

The spelling of 405198881 in words is "four hundred five million, one hundred ninety-eight thousand, eight hundred eighty-one".