638713127 has 16 divisors (see below), whose sum is σ = 714037632. Its totient is φ = 567544320.

The previous prime is 638713109. The next prime is 638713189. The reversal of 638713127 is 721317836.

It is a cyclic number.

It is not a de Polignac number, because 638713127 - 2¹⁴ = 638696743 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 (638713027) 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, 28703 + ... + 45839.

It is an arithmetic number, because the mean of its divisors is an integer number (44627352).

Almost surely, 2^638713127 is an apocalyptic number.

638713127 is a deficient number, since it is larger than the sum of its proper divisors (75324505).

638713127 is a wasteful number, since it uses less digits than its factorization.

638713127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17258.

The product of its digits is 42336, while the sum is 38.

The square root of 638713127 is about 25272.7744222909. The cubic root of 638713127 is about 861.1958876464.

The spelling of 638713127 in words is "six hundred thirty-eight million, seven hundred thirteen thousand, one hundred twenty-seven".