123881709 has 16 divisors (see below), whose sum is σ = 189002880. Its totient is φ = 70703040.

The previous prime is 123881699. The next prime is 123881741. The reversal of 123881709 is 907188321.

It is not a de Polignac number, because 123881709 - 2¹¹ = 123879661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123881309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16627 + ... + 22895.

It is an arithmetic number, because the mean of its divisors is an integer number (11812680).

Almost surely, 2^123881709 is an apocalyptic number.

It is an amenable number.

123881709 is a deficient number, since it is larger than the sum of its proper divisors (65121171).

123881709 is an equidigital number, since it uses as much as digits as its factorization.

123881709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 123881709 is about 11130.2160356392. The cubic root of 123881709 is about 498.5044766128.

Subtracting from 123881709 its sum of digits (39), we obtain a triangular number (123881670 = T₁₅₇₄₀).

The spelling of 123881709 in words is "one hundred twenty-three million, eight hundred eighty-one thousand, seven hundred nine".