123721877 has 2 divisors, whose sum is σ = 123721878. Its totient is φ = 123721876.

The previous prime is 123721817. The next prime is 123721889. The reversal of 123721877 is 778127321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108284836 + 15437041 = 10406^2 + 3929^2 .

It is a cyclic number.

It is not a de Polignac number, because 123721877 - 2¹⁰ = 123720853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123721877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123721817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61860938 + 61860939.

It is an arithmetic number, because the mean of its divisors is an integer number (61860939).

Almost surely, 2^123721877 is an apocalyptic number.

It is an amenable number.

123721877 is a deficient number, since it is larger than the sum of its proper divisors (1).

123721877 is an equidigital number, since it uses as much as digits as its factorization.

123721877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 38.

The square root of 123721877 is about 11123.0336239715. The cubic root of 123721877 is about 498.2899944289.

The spelling of 123721877 in words is "one hundred twenty-three million, seven hundred twenty-one thousand, eight hundred seventy-seven".