121854636 has 36 divisors (see below), whose sum is σ = 318645600. Its totient is φ = 39217248.

The previous prime is 121854613. The next prime is 121854659. The reversal of 121854636 is 636458121.

It is a happy number.

121854636 is a `hidden beast` number, since 1 + 2 + 18 + 5 + 4 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (121854613) and next prime (121854659).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 121854636.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57316 + ... + 59403.

Almost surely, 2^121854636 is an apocalyptic number.

It is an amenable number.

121854636 is an abundant number, since it is smaller than the sum of its proper divisors (196790964).

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

121854636 is a wasteful number, since it uses less digits than its factorization.

121854636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116758 (or 116753 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 121854636 is about 11038.7787367987. The cubic root of 121854636 is about 495.7705049565.

The spelling of 121854636 in words is "one hundred twenty-one million, eight hundred fifty-four thousand, six hundred thirty-six".