121605806 has 32 divisors (see below), whose sum is σ = 216099840. Its totient is φ = 50240736.

The previous prime is 121605769. The next prime is 121605823. The reversal of 121605806 is 608506121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46280 + ... + 48836.

It is an arithmetic number, because the mean of its divisors is an integer number (6753120).

Almost surely, 2^121605806 is an apocalyptic number.

121605806 is a deficient number, since it is larger than the sum of its proper divisors (94494034).

121605806 is a wasteful number, since it uses less digits than its factorization.

121605806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 121605806 is about 11027.5022557241. The cubic root of 121605806 is about 495.4328166968.

The spelling of 121605806 in words is "one hundred twenty-one million, six hundred five thousand, eight hundred six".