123290789 has 4 divisors (see below), whose sum is σ = 123318624. Its totient is φ = 123262956.

The previous prime is 123290777. The next prime is 123290837. The reversal of 123290789 is 987092321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123290789 - 2¹⁶ = 123225253 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123290759) 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 3 ways as a sum of consecutive naturals, for example, 5627 + ... + 16680.

It is an arithmetic number, because the mean of its divisors is an integer number (30829656).

Almost surely, 2^123290789 is an apocalyptic number.

It is an amenable number.

123290789 is a deficient number, since it is larger than the sum of its proper divisors (27835).

123290789 is an equidigital number, since it uses as much as digits as its factorization.

123290789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27834.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 123290789 is about 11103.6385477914. The cubic root of 123290789 is about 497.7105851591.

The spelling of 123290789 in words is "one hundred twenty-three million, two hundred ninety thousand, seven hundred eighty-nine".