117879421 has 4 divisors (see below), whose sum is σ = 128595744. Its totient is φ = 107163100.

The previous prime is 117879409. The next prime is 117879427. The reversal of 117879421 is 124978711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 117879421 - 2¹⁵ = 117846653 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 (117879427) 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, 5358145 + ... + 5358166.

It is an arithmetic number, because the mean of its divisors is an integer number (32148936).

Almost surely, 2^117879421 is an apocalyptic number.

117879421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117879421 is a deficient number, since it is larger than the sum of its proper divisors (10716323).

117879421 is a wasteful number, since it uses less digits than its factorization.

117879421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716322.

The product of its digits is 28224, while the sum is 40.

The square root of 117879421 is about 10857.2289742825. The cubic root of 117879421 is about 490.3196872600.

The spelling of 117879421 in words is "one hundred seventeen million, eight hundred seventy-nine thousand, four hundred twenty-one".