121189638 has 16 divisors (see below), whose sum is σ = 255136320. Its totient is φ = 38270376.

The previous prime is 121189589. The next prime is 121189643. The reversal of 121189638 is 836981121.

It is a junction number, because it is equal to n+sod(n) for n = 121189596 and 121189605.

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, 531420 + ... + 531647.

It is an arithmetic number, because the mean of its divisors is an integer number (15946020).

Almost surely, 2^121189638 is an apocalyptic number.

121189638 is an abundant number, since it is smaller than the sum of its proper divisors (133946682).

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

121189638 is a wasteful number, since it uses less digits than its factorization.

121189638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063091.

The product of its digits is 20736, while the sum is 39.

The square root of 121189638 is about 11008.6165343335. The cubic root of 121189638 is about 494.8670023264.

The spelling of 121189638 in words is "one hundred twenty-one million, one hundred eighty-nine thousand, six hundred thirty-eight".