405299727 has 24 divisors (see below), whose sum is σ = 698478000. Its totient is φ = 231599088.

The previous prime is 405299717. The next prime is 405299731. The reversal of 405299727 is 727992504.

It is not a de Polignac number, because 405299727 - 2⁴ = 405299711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405299717) 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 in 23 ways as a sum of consecutive naturals, for example, 151852 + ... + 154497.

It is an arithmetic number, because the mean of its divisors is an integer number (29103250).

Almost surely, 2^405299727 is an apocalyptic number.

405299727 is a deficient number, since it is larger than the sum of its proper divisors (293178273).

405299727 is a wasteful number, since it uses less digits than its factorization.

405299727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306372 (or 306359 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 405299727 is about 20132.0571974153. The cubic root of 405299727 is about 740.0460934279.

The spelling of 405299727 in words is "four hundred five million, two hundred ninety-nine thousand, seven hundred twenty-seven".