118399509 has 64 divisors (see below), whose sum is σ = 196577280. Its totient is φ = 70087680.

The previous prime is 118399499. The next prime is 118399549. The reversal of 118399509 is 905993811.

It is not a de Polignac number, because 118399509 - 2⁷ = 118399381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118399549) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 754059 + ... + 754215.

It is an arithmetic number, because the mean of its divisors is an integer number (3071520).

Almost surely, 2^118399509 is an apocalyptic number.

It is an amenable number.

118399509 is a deficient number, since it is larger than the sum of its proper divisors (78177771).

118399509 is a wasteful number, since it uses less digits than its factorization.

118399509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 118399509 is about 10881.1538450662. The cubic root of 118399509 is about 491.0397317010.

The spelling of 118399509 in words is "one hundred eighteen million, three hundred ninety-nine thousand, five hundred nine".