118408993 has 4 divisors (see below), whose sum is σ = 120031108. Its totient is φ = 116786880.

The previous prime is 118408987. The next prime is 118409003. The reversal of 118408993 is 399804811.

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 47983329 + 70425664 = 6927^2 + 8392^2 .

It is a cyclic number.

It is not a de Polignac number, because 118408993 - 2⁹ = 118408481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118408093) 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, 810948 + ... + 811093.

It is an arithmetic number, because the mean of its divisors is an integer number (30007777).

Almost surely, 2^118408993 is an apocalyptic number.

It is an amenable number.

118408993 is a deficient number, since it is larger than the sum of its proper divisors (1622115).

118408993 is an equidigital number, since it uses as much as digits as its factorization.

118408993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622114.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 118408993 is about 10881.5896357104. The cubic root of 118408993 is about 491.0528423874.

The spelling of 118408993 in words is "one hundred eighteen million, four hundred eight thousand, nine hundred ninety-three".