117378721 has 4 divisors (see below), whose sum is σ = 118455700. Its totient is φ = 116301744.

The previous prime is 117378719. The next prime is 117378731. The reversal of 117378721 is 127873711.

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

It can be written as a sum of positive squares in 2 ways, for example, as 95335696 + 22043025 = 9764^2 + 4695^2 .

It is a cyclic number.

It is not a de Polignac number, because 117378721 - 2¹ = 117378719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117378731) 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, 538326 + ... + 538543.

It is an arithmetic number, because the mean of its divisors is an integer number (29613925).

Almost surely, 2^117378721 is an apocalyptic number.

It is an amenable number.

117378721 is a deficient number, since it is larger than the sum of its proper divisors (1076979).

117378721 is a wasteful number, since it uses less digits than its factorization.

117378721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076978.

The product of its digits is 16464, while the sum is 37.

The square root of 117378721 is about 10834.1460669496. The cubic root of 117378721 is about 489.6244811353.

The spelling of 117378721 in words is "one hundred seventeen million, three hundred seventy-eight thousand, seven hundred twenty-one".