405740169 has 6 divisors (see below), whose sum is σ = 586069146. Its totient is φ = 270493440.

The previous prime is 405740149. The next prime is 405740191. The reversal of 405740169 is 961047504.

It can be written as a sum of positive squares in only one way, i.e., 391564944 + 14175225 = 19788^2 + 3765^2 .

It is not a de Polignac number, because 405740169 - 2⁹ = 405739657 is a prime.

It is a super-2 number, since 2×405740169² = 329250169480297122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405740149) 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 in 5 ways as a sum of consecutive naturals, for example, 22541112 + ... + 22541129.

It is an arithmetic number, because the mean of its divisors is an integer number (97678191).

Almost surely, 2^405740169 is an apocalyptic number.

It is an amenable number.

405740169 is a deficient number, since it is larger than the sum of its proper divisors (180328977).

405740169 is a wasteful number, since it uses less digits than its factorization.

405740169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45082247 (or 45082244 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 405740169 is about 20142.9930496935. The cubic root of 405740169 is about 740.3140674409.

The spelling of 405740169 in words is "four hundred five million, seven hundred forty thousand, one hundred sixty-nine".