121906805 has 8 divisors (see below), whose sum is σ = 146362272. Its totient is φ = 97476048.

The previous prime is 121906801. The next prime is 121906859. The reversal of 121906805 is 508609121.

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

It is a cyclic number.

It is not a de Polignac number, because 121906805 - 2² = 121906801 is a prime.

It is a super-2 number, since 2×121906805² = 29722538210616050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121906801) by changing a digit.

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, 7394 + ... + 17276.

It is an arithmetic number, because the mean of its divisors is an integer number (18295284).

Almost surely, 2^121906805 is an apocalyptic number.

It is an amenable number.

121906805 is a deficient number, since it is larger than the sum of its proper divisors (24455467).

121906805 is an equidigital number, since it uses as much as digits as its factorization.

121906805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12355.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 121906805 is about 11041.1414717863. The cubic root of 121906805 is about 495.8412454229.

The spelling of 121906805 in words is "one hundred twenty-one million, nine hundred six thousand, eight hundred five".