123557827 has 2 divisors, whose sum is σ = 123557828. Its totient is φ = 123557826.

The previous prime is 123557801. The next prime is 123557831. The reversal of 123557827 is 728755321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123557827 - 2⁷ = 123557699 is a prime.

It is a super-2 number, since 2×123557827² = 30533073225923858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123557827.

It is not a weakly prime, because it can be changed into another prime (123557857) 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, 61778913 + 61778914.

It is an arithmetic number, because the mean of its divisors is an integer number (61778914).

Almost surely, 2^123557827 is an apocalyptic number.

123557827 is a deficient number, since it is larger than the sum of its proper divisors (1).

123557827 is an equidigital number, since it uses as much as digits as its factorization.

123557827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 40.

The square root of 123557827 is about 11115.6568406910. The cubic root of 123557827 is about 498.0696598308.

The spelling of 123557827 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, eight hundred twenty-seven".