123400889 has 2 divisors, whose sum is σ = 123400890. Its totient is φ = 123400888.

The previous prime is 123400873. The next prime is 123400973. The reversal of 123400889 is 988004321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123387664 + 13225 = 11108^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 123400889 - 2⁴ = 123400873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123400289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61700444 + 61700445.

It is an arithmetic number, because the mean of its divisors is an integer number (61700445).

Almost surely, 2^123400889 is an apocalyptic number.

It is an amenable number.

123400889 is a deficient number, since it is larger than the sum of its proper divisors (1).

123400889 is an equidigital number, since it uses as much as digits as its factorization.

123400889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 123400889 is about 11108.5952757313. The cubic root of 123400889 is about 497.8586947144.

The spelling of 123400889 in words is "one hundred twenty-three million, four hundred thousand, eight hundred eighty-nine".