122405905 has 8 divisors (see below), whose sum is σ = 147067200. Its totient is φ = 97804656.

The previous prime is 122405903. The next prime is 122405911. The reversal of 122405905 is 509504221.

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 122405905 - 2¹ = 122405903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122405903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10395 + ... + 18784.

It is an arithmetic number, because the mean of its divisors is an integer number (18383400).

Almost surely, 2^122405905 is an apocalyptic number.

It is an amenable number.

122405905 is a deficient number, since it is larger than the sum of its proper divisors (24661295).

122405905 is an equidigital number, since it uses as much as digits as its factorization.

122405905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30023.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 122405905 is about 11063.7202151898. The cubic root of 122405905 is about 496.5170004324.

It can be divided in two parts, 12240 and 5905, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 122405905 in words is "one hundred twenty-two million, four hundred five thousand, nine hundred five".