638580953 has 4 divisors (see below), whose sum is σ = 648112080. Its totient is φ = 629049828.

The previous prime is 638580949. The next prime is 638580961. The reversal of 638580953 is 359085836.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638580953 - 2² = 638580949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638580898 and 638580907.

It is not an unprimeable number, because it can be changed into a prime (638580923) 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 3 ways as a sum of consecutive naturals, for example, 4765463 + ... + 4765596.

It is an arithmetic number, because the mean of its divisors is an integer number (162028020).

Almost surely, 2^638580953 is an apocalyptic number.

It is an amenable number.

638580953 is a deficient number, since it is larger than the sum of its proper divisors (9531127).

638580953 is an equidigital number, since it uses as much as digits as its factorization.

638580953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531126.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 638580953 is about 25270.1593386350. The cubic root of 638580953 is about 861.1364788377.

The spelling of 638580953 in words is "six hundred thirty-eight million, five hundred eighty thousand, nine hundred fifty-three".