123561939 has 16 divisors (see below), whose sum is σ = 172468224. Its totient is φ = 78590400.

The previous prime is 123561937. The next prime is 123561947. The reversal of 123561939 is 939165321.

It is not a de Polignac number, because 123561939 - 2¹ = 123561937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123561897 and 123561906.

It is not an unprimeable number, because it can be changed into a prime (123561931) 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, 2754 + ... + 15959.

It is an arithmetic number, because the mean of its divisors is an integer number (10779264).

Almost surely, 2^123561939 is an apocalyptic number.

123561939 is a deficient number, since it is larger than the sum of its proper divisors (48906285).

123561939 is a wasteful number, since it uses less digits than its factorization.

123561939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818.

The product of its digits is 43740, while the sum is 39.

The square root of 123561939 is about 11115.8418034803. The cubic root of 123561939 is about 498.0751850163.

The spelling of 123561939 in words is "one hundred twenty-three million, five hundred sixty-one thousand, nine hundred thirty-nine".