285429505 has 4 divisors (see below), whose sum is σ = 342515412. Its totient is φ = 228343600.

The previous prime is 285429461. The next prime is 285429509. The reversal of 285429505 is 505924582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58384881 + 227044624 = 7641^2 + 15068^2 .

It is not a de Polignac number, because 285429505 - 2²⁷ = 151211777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285429509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28542946 + ... + 28542955.

It is an arithmetic number, because the mean of its divisors is an integer number (85628853).

Almost surely, 2^285429505 is an apocalyptic number.

It is an amenable number.

285429505 is a deficient number, since it is larger than the sum of its proper divisors (57085907).

285429505 is an equidigital number, since it uses as much as digits as its factorization.

285429505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57085906.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 285429505 is about 16894.6590672911. The cubic root of 285429505 is about 658.4148560406.

The spelling of 285429505 in words is "two hundred eighty-five million, four hundred twenty-nine thousand, five hundred five".