499388409 has 45 divisors (see below), whose sum is σ = 812050239. Its totient is φ = 305706960.

The previous prime is 499388389. The next prime is 499388429. The reversal of 499388409 is 904883994.

The square root of 499388409 is 22347.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (499388389) and next prime (499388429).

It can be written as a sum of positive squares in only one way, i.e., 73874025 + 425514384 = 8595^2 + 20628^2 .

It is not a de Polignac number, because 499388409 - 2⁵ = 499388377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499388429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2614504 + ... + 2614694.

Almost surely, 2^499388409 is an apocalyptic number.

499388409 is the 22347-th square number.

499388409 is the 11174-th centered octagonal number.

It is an amenable number.

499388409 is a deficient number, since it is larger than the sum of its proper divisors (312661830).

499388409 is an equidigital number, since it uses as much as digits as its factorization.

499388409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The cubic root of 499388409 is about 793.3767805494.

The spelling of 499388409 in words is "four hundred ninety-nine million, three hundred eighty-eight thousand, four hundred nine".