502742409 has 32 divisors (see below), whose sum is σ = 747823104. Its totient is φ = 298455360.

The previous prime is 502742393. The next prime is 502742431. The reversal of 502742409 is 904247205.

It is not a de Polignac number, because 502742409 - 2⁴ = 502742393 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 502742409.

It is not an unprimeable number, because it can be changed into a prime (502742509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128212 + ... + 132074.

It is an arithmetic number, because the mean of its divisors is an integer number (23369472).

Almost surely, 2^502742409 is an apocalyptic number.

It is an amenable number.

502742409 is a deficient number, since it is larger than the sum of its proper divisors (245080695).

502742409 is a wasteful number, since it uses less digits than its factorization.

502742409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 502742409 is about 22421.9180490876. The cubic root of 502742409 is about 795.1489820076.

The spelling of 502742409 in words is "five hundred two million, seven hundred forty-two thousand, four hundred nine".