117638421 has 8 divisors (see below), whose sum is σ = 157112064. Its totient is φ = 78295200.

The previous prime is 117638407. The next prime is 117638431. The reversal of 117638421 is 124836711.

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

It is not a de Polignac number, because 117638421 - 2⁷ = 117638293 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117638431) 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, 30480 + ... + 34121.

It is an arithmetic number, because the mean of its divisors is an integer number (19639008).

Almost surely, 2^117638421 is an apocalyptic number.

It is an amenable number.

117638421 is a deficient number, since it is larger than the sum of its proper divisors (39473643).

117638421 is an equidigital number, since it uses as much as digits as its factorization.

117638421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65211.

The product of its digits is 8064, while the sum is 33.

The square root of 117638421 is about 10846.1246996335. The cubic root of 117638421 is about 489.9853126238.

The spelling of 117638421 in words is "one hundred seventeen million, six hundred thirty-eight thousand, four hundred twenty-one".