123887309 has 12 divisors (see below), whose sum is σ = 153315936. Its totient is φ = 98019792.

The previous prime is 123887273. The next prime is 123887311. The reversal of 123887309 is 903788321.

It is not a de Polignac number, because 123887309 - 2⁸ = 123887053 is a prime.

It is a super-3 number, since 3×123887309³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123887339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51179 + ... + 53544.

It is an arithmetic number, because the mean of its divisors is an integer number (12776328).

Almost surely, 2^123887309 is an apocalyptic number.

It is an amenable number.

123887309 is a deficient number, since it is larger than the sum of its proper divisors (29428627).

123887309 is a wasteful number, since it uses less digits than its factorization.

123887309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104756 (or 104743 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 123887309 is about 11130.4676002403. The cubic root of 123887309 is about 498.5119880337.

The spelling of 123887309 in words is "one hundred twenty-three million, eight hundred eighty-seven thousand, three hundred nine".