638796423 has 8 divisors (see below), whose sum is σ = 853875568. Its totient is φ = 424790784.

The previous prime is 638796413. The next prime is 638796451. The reversal of 638796423 is 324697836.

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

It is not a de Polignac number, because 638796423 - 2⁸ = 638796167 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 (638796413) 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, 266986 + ... + 269367.

It is an arithmetic number, because the mean of its divisors is an integer number (106734446).

Almost surely, 2^638796423 is an apocalyptic number.

638796423 is a deficient number, since it is larger than the sum of its proper divisors (215079145).

638796423 is a wasteful number, since it uses less digits than its factorization.

638796423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536753.

The product of its digits is 1306368, while the sum is 48.

The square root of 638796423 is about 25274.4223079381. The cubic root of 638796423 is about 861.2333228430.

The spelling of 638796423 in words is "six hundred thirty-eight million, seven hundred ninety-six thousand, four hundred twenty-three".