121808906 has 8 divisors (see below), whose sum is σ = 182961504. Its totient is φ = 60821740.

The previous prime is 121808857. The next prime is 121808923. The reversal of 121808906 is 609808121.

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

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, 39500 + ... + 42471.

It is an arithmetic number, because the mean of its divisors is an integer number (22870188).

Almost surely, 2^121808906 is an apocalyptic number.

121808906 is a deficient number, since it is larger than the sum of its proper divisors (61152598).

121808906 is an equidigital number, since it uses as much as digits as its factorization.

121808906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82716.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 121808906 is about 11036.7072082211. The cubic root of 121808906 is about 495.7084790798.

The spelling of 121808906 in words is "one hundred twenty-one million, eight hundred eight thousand, nine hundred six".