122456789 has 32 divisors (see below), whose sum is σ = 157753344. Its totient is φ = 92456640.

The previous prime is 122456779. The next prime is 122456809. The reversal of 122456789 is 987654221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 122456789 - 2⁴ = 122456773 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122456749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233882 + ... + 234404.

It is an arithmetic number, because the mean of its divisors is an integer number (4929792).

Almost surely, 2^122456789 is an apocalyptic number.

It is an amenable number.

122456789 is a deficient number, since it is larger than the sum of its proper divisors (35296555).

122456789 is a wasteful number, since it uses less digits than its factorization.

122456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657.

The product of its digits is 241920, while the sum is 44.

The square root of 122456789 is about 11066.0195644143. The cubic root of 122456789 is about 496.5857914247.

The spelling of 122456789 in words is "one hundred twenty-two million, four hundred fifty-six thousand, seven hundred eighty-nine".