638881223 has 8 divisors (see below), whose sum is σ = 661193280. Its totient is φ = 616588000.

The previous prime is 638881219. The next prime is 638881237. The reversal of 638881223 is 322188836.

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 638881223 - 2² = 638881219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638881253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132098 + ... + 136848.

It is an arithmetic number, because the mean of its divisors is an integer number (82649160).

Almost surely, 2^638881223 is an apocalyptic number.

638881223 is a deficient number, since it is larger than the sum of its proper divisors (22312057).

638881223 is a wasteful number, since it uses less digits than its factorization.

638881223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9417.

The product of its digits is 110592, while the sum is 41.

The square root of 638881223 is about 25276.0998375936. The cubic root of 638881223 is about 861.2714306302.

The spelling of 638881223 in words is "six hundred thirty-eight million, eight hundred eighty-one thousand, two hundred twenty-three".