638453889 has 12 divisors (see below), whose sum is σ = 926848000. Its totient is φ = 423495864.

The previous prime is 638453869. The next prime is 638453899. The reversal of 638453889 is 988354836.

It is a happy number.

It is not a de Polignac number, because 638453889 - 2¹¹ = 638451841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638453869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176449 + ... + 180030.

Almost surely, 2^638453889 is an apocalyptic number.

It is an amenable number.

638453889 is a deficient number, since it is larger than the sum of its proper divisors (288394111).

638453889 is a wasteful number, since it uses less digits than its factorization.

638453889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356684 (or 356681 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 638453889 is about 25267.6451019876. The cubic root of 638453889 is about 861.0793591135.

The spelling of 638453889 in words is "six hundred thirty-eight million, four hundred fifty-three thousand, eight hundred eighty-nine".