638265009 has 8 divisors (see below), whose sum is σ = 865444320. Its totient is φ = 418297856.

The previous prime is 638265007. The next prime is 638265011. The reversal of 638265009 is 900562836.

It is an interprime number because it is at equal distance from previous prime (638265007) and next prime (638265011).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638265009 - 2¹ = 638265007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638265007) 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 7 ways as a sum of consecutive naturals, for example, 1802832 + ... + 1803185.

It is an arithmetic number, because the mean of its divisors is an integer number (108180540).

Almost surely, 2^638265009 is an apocalyptic number.

It is an amenable number.

638265009 is a deficient number, since it is larger than the sum of its proper divisors (227179311).

638265009 is a wasteful number, since it uses less digits than its factorization.

638265009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606079.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 638265009 is about 25263.9072393801. The cubic root of 638265009 is about 860.9944369219.

The spelling of 638265009 in words is "six hundred thirty-eight million, two hundred sixty-five thousand, nine".