121587618 has 16 divisors (see below), whose sum is σ = 247764096. Its totient is φ = 39764400.

The previous prime is 121587601. The next prime is 121587619. The reversal of 121587618 is 816785121.

It is not an unprimeable number, because it can be changed into a prime (121587619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190858 + ... + 191493.

It is an arithmetic number, because the mean of its divisors is an integer number (15485256).

Almost surely, 2^121587618 is an apocalyptic number.

121587618 is an abundant number, since it is smaller than the sum of its proper divisors (126176478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121587618 is a wasteful number, since it uses less digits than its factorization.

121587618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382409.

The product of its digits is 26880, while the sum is 39.

The square root of 121587618 is about 11026.6775594465. The cubic root of 121587618 is about 495.4081156247.

The spelling of 121587618 in words is "one hundred twenty-one million, five hundred eighty-seven thousand, six hundred eighteen".