638373423 has 4 divisors (see below), whose sum is σ = 851164568. Its totient is φ = 425582280.

The previous prime is 638373413. The next prime is 638373427. The reversal of 638373423 is 324373836.

638373423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-638373423 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 (638373427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106395568 + ... + 106395573.

It is an arithmetic number, because the mean of its divisors is an integer number (212791142).

Almost surely, 2^638373423 is an apocalyptic number.

638373423 is a deficient number, since it is larger than the sum of its proper divisors (212791145).

638373423 is a wasteful number, since it uses less digits than its factorization.

638373423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212791144.

The product of its digits is 217728, while the sum is 39.

The square root of 638373423 is about 25266.0527783823. The cubic root of 638373423 is about 861.0431829051.

The spelling of 638373423 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, four hundred twenty-three".