121905896 has 16 divisors (see below), whose sum is σ = 261227040. Its totient is φ = 52245360.

The previous prime is 121905893. The next prime is 121905913. The reversal of 121905896 is 698509121.

It is a happy number.

It is a super-2 number, since 2×121905896² = 29722094959125632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121905893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088390 + ... + 1088501.

It is an arithmetic number, because the mean of its divisors is an integer number (16326690).

Almost surely, 2^121905896 is an apocalyptic number.

It is an amenable number.

121905896 is an abundant number, since it is smaller than the sum of its proper divisors (139321144).

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

121905896 is a wasteful number, since it uses less digits than its factorization.

121905896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176904 (or 2176900 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 121905896 is about 11041.1003074875. The cubic root of 121905896 is about 495.8400130039.

The spelling of 121905896 in words is "one hundred twenty-one million, nine hundred five thousand, eight hundred ninety-six".