123721126 has 8 divisors (see below), whose sum is σ = 185737104. Its totient is φ = 61808760.

The previous prime is 123721099. The next prime is 123721127. The reversal of 123721126 is 621127321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 123721126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123721127) 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, 22845 + ... + 27736.

It is an arithmetic number, because the mean of its divisors is an integer number (23217138).

Almost surely, 2^123721126 is an apocalyptic number.

123721126 is a deficient number, since it is larger than the sum of its proper divisors (62015978).

123721126 is a wasteful number, since it uses less digits than its factorization.

123721126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51806.

The product of its digits is 1008, while the sum is 25.

The square root of 123721126 is about 11122.9998651443. Note that the first 3 decimals coincide. The cubic root of 123721126 is about 498.2889862091.

Adding to 123721126 its reverse (621127321), we get a palindrome (744848447).

The spelling of 123721126 in words is "one hundred twenty-three million, seven hundred twenty-one thousand, one hundred twenty-six".