118640905 has 4 divisors (see below), whose sum is σ = 142369092. Its totient is φ = 94912720.

The previous prime is 118640903. The next prime is 118640911. The reversal of 118640905 is 509046811.

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 48818169 + 69822736 = 6987^2 + 8356^2 .

It is not a de Polignac number, because 118640905 - 2¹ = 118640903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118640903) 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, 11864086 + ... + 11864095.

It is an arithmetic number, because the mean of its divisors is an integer number (35592273).

Almost surely, 2^118640905 is an apocalyptic number.

It is an amenable number.

118640905 is a deficient number, since it is larger than the sum of its proper divisors (23728187).

118640905 is an equidigital number, since it uses as much as digits as its factorization.

118640905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23728186.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 118640905 is about 10892.2405867663. The cubic root of 118640905 is about 491.3732200231.

The spelling of 118640905 in words is "one hundred eighteen million, six hundred forty thousand, nine hundred five".