121638834 has 20 divisors (see below), whose sum is σ = 272561454. Its totient is φ = 40546224.

The previous prime is 121638827. The next prime is 121638851. The reversal of 121638834 is 438836121.

121638834 is a `hidden beast` number, since 12 + 1 + 638 + 8 + 3 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 121550625 + 88209 = 11025^2 + 297^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 375267 + ... + 375590.

Almost surely, 2^121638834 is an apocalyptic number.

121638834 is an abundant number, since it is smaller than the sum of its proper divisors (150922620).

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

121638834 is an equidigital number, since it uses as much as digits as its factorization.

121638834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750871 (or 750862 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 121638834 is about 11028.9996826548. Note that the first 3 decimals coincide. The cubic root of 121638834 is about 495.4776656352.

The spelling of 121638834 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, eight hundred thirty-four".