638109273 has 16 divisors (see below), whose sum is σ = 866866176. Its totient is φ = 417428880.

The previous prime is 638109259. The next prime is 638109313. The reversal of 638109273 is 372901836.

It is not a de Polignac number, because 638109273 - 2⁴ = 638109257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638109223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46828 + ... + 58898.

It is an arithmetic number, because the mean of its divisors is an integer number (54179136).

Almost surely, 2^638109273 is an apocalyptic number.

It is an amenable number.

638109273 is a deficient number, since it is larger than the sum of its proper divisors (228756903).

638109273 is a wasteful number, since it uses less digits than its factorization.

638109273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 638109273 is about 25260.8248677671. The cubic root of 638109273 is about 860.9244039758.

The spelling of 638109273 in words is "six hundred thirty-eight million, one hundred nine thousand, two hundred seventy-three".