638364489 has 32 divisors (see below), whose sum is σ = 1043297280. Its totient is φ = 339049152.

The previous prime is 638364473. The next prime is 638364497. The reversal of 638364489 is 984463836.

It is a happy number.

It is not a de Polignac number, because 638364489 - 2⁴ = 638364473 is a prime.

It is a super-2 number, since 2×638364489² = 815018441632462242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638364499) 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 31 ways as a sum of consecutive naturals, for example, 6054 + ... + 36240.

It is an arithmetic number, because the mean of its divisors is an integer number (32603040).

Almost surely, 2^638364489 is an apocalyptic number.

It is an amenable number.

638364489 is a deficient number, since it is larger than the sum of its proper divisors (404932791).

638364489 is a wasteful number, since it uses less digits than its factorization.

638364489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30269.

The product of its digits is 2985984, while the sum is 51.

The square root of 638364489 is about 25265.8759792729. The cubic root of 638364489 is about 861.0391661362.

The spelling of 638364489 in words is "six hundred thirty-eight million, three hundred sixty-four thousand, four hundred eighty-nine".