121388618 has 32 divisors (see below), whose sum is σ = 209647872. Its totient is φ = 52272000.

The previous prime is 121388593. The next prime is 121388621. The reversal of 121388618 is 816883121.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22043 + ... + 26993.

It is an arithmetic number, because the mean of its divisors is an integer number (6551496).

Almost surely, 2^121388618 is an apocalyptic number.

121388618 is a deficient number, since it is larger than the sum of its proper divisors (88259254).

121388618 is a wasteful number, since it uses less digits than its factorization.

121388618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030.

The product of its digits is 18432, while the sum is 38.

The square root of 121388618 is about 11017.6502939601. The cubic root of 121388618 is about 495.1376932186.

The spelling of 121388618 in words is "one hundred twenty-one million, three hundred eighty-eight thousand, six hundred eighteen".