123439869 has 48 divisors (see below), whose sum is σ = 215779200. Its totient is φ = 70489440.

The previous prime is 123439867. The next prime is 123439871. The reversal of 123439869 is 968934321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123439867) and next prime (123439871).

It is not a de Polignac number, because 123439869 - 2¹ = 123439867 is a prime.

It is a super-2 number, since 2×123439869² = 30474802517474322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123439867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82609 + ... + 84089.

It is an arithmetic number, because the mean of its divisors is an integer number (4495400).

Almost surely, 2^123439869 is an apocalyptic number.

It is an amenable number.

123439869 is a deficient number, since it is larger than the sum of its proper divisors (92339331).

123439869 is an frugal number, since it uses more digits than its factorization.

123439869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517 (or 1491 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 123439869 is about 11110.3496344625. The cubic root of 123439869 is about 497.9111105683.

The spelling of 123439869 in words is "one hundred twenty-three million, four hundred thirty-nine thousand, eight hundred sixty-nine".