405397849 has 2 divisors, whose sum is σ = 405397850. Its totient is φ = 405397848.

The previous prime is 405397831. The next prime is 405397871. The reversal of 405397849 is 948793504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402724624 + 2673225 = 20068^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 405397849 - 2¹⁹ = 404873561 is a prime.

It is not a weakly prime, because it can be changed into another prime (405397879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202698924 + 202698925.

It is an arithmetic number, because the mean of its divisors is an integer number (202698925).

Almost surely, 2^405397849 is an apocalyptic number.

It is an amenable number.

405397849 is a deficient number, since it is larger than the sum of its proper divisors (1).

405397849 is an equidigital number, since it uses as much as digits as its factorization.

405397849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 405397849 is about 20134.4940090383. The cubic root of 405397849 is about 740.1058096813.

The spelling of 405397849 in words is "four hundred five million, three hundred ninety-seven thousand, eight hundred forty-nine".