123669789 has 4 divisors (see below), whose sum is σ = 164893056. Its totient is φ = 82446524.

The previous prime is 123669787. The next prime is 123669797. The reversal of 123669789 is 987966321.

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 123669789 - 2¹ = 123669787 is a prime.

It is a super-2 number, since 2×123669789² = 30588433422609042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123669787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20611629 + ... + 20611634.

It is an arithmetic number, because the mean of its divisors is an integer number (41223264).

Almost surely, 2^123669789 is an apocalyptic number.

It is an amenable number.

123669789 is a deficient number, since it is larger than the sum of its proper divisors (41223267).

123669789 is an equidigital number, since it uses as much as digits as its factorization.

123669789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41223266.

The product of its digits is 979776, while the sum is 51.

The square root of 123669789 is about 11120.6919299116. The cubic root of 123669789 is about 498.2200564542.

It can be divided in two parts, 12366 and 9789, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 123669789 in words is "one hundred twenty-three million, six hundred sixty-nine thousand, seven hundred eighty-nine".