122205645 has 16 divisors (see below), whose sum is σ = 217254720. Its totient is φ = 65176272.

The previous prime is 122205641. The next prime is 122205649. The reversal of 122205645 is 546502221.

122205645 is a `hidden beast` number, since 12 + 2 + 2 + 0 + 5 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (122205641) and next prime (122205649).

It is not a de Polignac number, because 122205645 - 2² = 122205641 is a prime.

It is a super-3 number, since 3×122205645³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122205641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452479 + ... + 452748.

It is an arithmetic number, because the mean of its divisors is an integer number (13578420).

Almost surely, 2^122205645 is an apocalyptic number.

122205645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

122205645 is a deficient number, since it is larger than the sum of its proper divisors (95049075).

122205645 is an equidigital number, since it uses as much as digits as its factorization.

122205645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905241 (or 905235 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 122205645 is about 11054.6662093435. Note that the first 3 decimals coincide. The cubic root of 122205645 is about 496.2460800364.

Adding to 122205645 its reverse (546502221), we get a palindrome (668707866).

The spelling of 122205645 in words is "one hundred twenty-two million, two hundred five thousand, six hundred forty-five".