121905638 has 8 divisors (see below), whose sum is σ = 183164520. Its totient is φ = 60850800.

The previous prime is 121905613. The next prime is 121905659. The reversal of 121905638 is 836509121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121905598 and 121905607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49508 + ... + 51911.

It is an arithmetic number, because the mean of its divisors is an integer number (22895565).

Almost surely, 2^121905638 is an apocalyptic number.

121905638 is a deficient number, since it is larger than the sum of its proper divisors (61258882).

121905638 is a wasteful number, since it uses less digits than its factorization.

121905638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102022.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 121905638 is about 11041.0886238631. The cubic root of 121905638 is about 495.8396632073.

The spelling of 121905638 in words is "one hundred twenty-one million, nine hundred five thousand, six hundred thirty-eight".