405869197 has 2 divisors, whose sum is σ = 405869198. Its totient is φ = 405869196.

The previous prime is 405869161. The next prime is 405869231. The reversal of 405869197 is 791968504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314743081 + 91126116 = 17741^2 + 9546^2 .

It is a cyclic number.

It is not a de Polignac number, because 405869197 - 2¹¹ = 405867149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405869197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405869117) 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, 202934598 + 202934599.

It is an arithmetic number, because the mean of its divisors is an integer number (202934599).

Almost surely, 2^405869197 is an apocalyptic number.

It is an amenable number.

405869197 is a deficient number, since it is larger than the sum of its proper divisors (1).

405869197 is an equidigital number, since it uses as much as digits as its factorization.

405869197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 405869197 is about 20146.1955961914. The cubic root of 405869197 is about 740.3925340123.

The spelling of 405869197 in words is "four hundred five million, eight hundred sixty-nine thousand, one hundred ninety-seven".