123189869 has 4 divisors (see below), whose sum is σ = 134388960. Its totient is φ = 111990780.

The previous prime is 123189853. The next prime is 123189881. The reversal of 123189869 is 968981321.

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 not a de Polignac number, because 123189869 - 2⁴ = 123189853 is a prime.

It is a super-2 number, since 2×123189869² = 30351487648474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123189839) 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, 5599529 + ... + 5599550.

It is an arithmetic number, because the mean of its divisors is an integer number (33597240).

Almost surely, 2^123189869 is an apocalyptic number.

It is an amenable number.

123189869 is a deficient number, since it is larger than the sum of its proper divisors (11199091).

123189869 is a wasteful number, since it uses less digits than its factorization.

123189869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11199090.

The product of its digits is 186624, while the sum is 47.

The square root of 123189869 is about 11099.0931611551. The cubic root of 123189869 is about 497.5747473188.

The spelling of 123189869 in words is "one hundred twenty-three million, one hundred eighty-nine thousand, eight hundred sixty-nine".