638224873 has 8 divisors (see below), whose sum is σ = 749802816. Its totient is φ = 535573200.

The previous prime is 638224859. The next prime is 638224879. The reversal of 638224873 is 378422836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638224873 is a prime.

It is a super-2 number, since 2×638224873² = 814661977031732258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638224879) 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, 2231413 + ... + 2231698.

It is an arithmetic number, because the mean of its divisors is an integer number (93725352).

Almost surely, 2^638224873 is an apocalyptic number.

It is an amenable number.

638224873 is a deficient number, since it is larger than the sum of its proper divisors (111577943).

638224873 is a wasteful number, since it uses less digits than its factorization.

638224873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4463135.

The product of its digits is 387072, while the sum is 43.

The square root of 638224873 is about 25263.1128921200. The cubic root of 638224873 is about 860.9763892475.

The spelling of 638224873 in words is "six hundred thirty-eight million, two hundred twenty-four thousand, eight hundred seventy-three".