117907945 has 4 divisors (see below), whose sum is σ = 141489540. Its totient is φ = 94326352.

The previous prime is 117907919. The next prime is 117907949. The reversal of 117907945 is 549709711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549709711 = 4409 ⋅124679.

It can be written as a sum of positive squares in 2 ways, for example, as 19263321 + 98644624 = 4389^2 + 9932^2 .

It is a cyclic number.

It is not a de Polignac number, because 117907945 - 2¹³ = 117899753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117907949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11790790 + ... + 11790799.

It is an arithmetic number, because the mean of its divisors is an integer number (35372385).

Almost surely, 2^117907945 is an apocalyptic number.

It is an amenable number.

117907945 is a deficient number, since it is larger than the sum of its proper divisors (23581595).

117907945 is an equidigital number, since it uses as much as digits as its factorization.

117907945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23581594.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 117907945 is about 10858.5424896714. The cubic root of 117907945 is about 490.3592326155.

The spelling of 117907945 in words is "one hundred seventeen million, nine hundred seven thousand, nine hundred forty-five".