121638830 has 16 divisors (see below), whose sum is σ = 224042544. Its totient is φ = 47523840.

The previous prime is 121638827. The next prime is 121638851. The reversal of 121638830 is 38836121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141011 + ... + 141870.

It is an arithmetic number, because the mean of its divisors is an integer number (14002659).

Almost surely, 2^121638830 is an apocalyptic number.

121638830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121638830 is a deficient number, since it is larger than the sum of its proper divisors (102403714).

121638830 is a wasteful number, since it uses less digits than its factorization.

121638830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282931.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 121638830 is about 11028.9995013147. Note that the first 3 decimals coincide. The cubic root of 121638830 is about 495.4776602041.

The spelling of 121638830 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, eight hundred thirty".