121839818 has 8 divisors (see below), whose sum is σ = 192378720. Its totient is φ = 57713580.

The previous prime is 121839803. The next prime is 121839829. The reversal of 121839818 is 818938121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603118 + ... + 1603193.

It is an arithmetic number, because the mean of its divisors is an integer number (24047340).

Almost surely, 2^121839818 is an apocalyptic number.

121839818 is a deficient number, since it is larger than the sum of its proper divisors (70538902).

121839818 is a wasteful number, since it uses less digits than its factorization.

121839818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206332.

The product of its digits is 27648, while the sum is 41.

The square root of 121839818 is about 11038.1075370736. The cubic root of 121839818 is about 495.7504082648.

The spelling of 121839818 in words is "one hundred twenty-one million, eight hundred thirty-nine thousand, eight hundred eighteen".