123540829 has 2 divisors, whose sum is σ = 123540830. Its totient is φ = 123540828.

The previous prime is 123540803. The next prime is 123540881. The reversal of 123540829 is 928045321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118853604 + 4687225 = 10902^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 123540829 - 2¹³ = 123532637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123540794 and 123540803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123541829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61770414 + 61770415.

It is an arithmetic number, because the mean of its divisors is an integer number (61770415).

Almost surely, 2^123540829 is an apocalyptic number.

It is an amenable number.

123540829 is a deficient number, since it is larger than the sum of its proper divisors (1).

123540829 is an equidigital number, since it uses as much as digits as its factorization.

123540829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 123540829 is about 11114.8922172012. The cubic root of 123540829 is about 498.0468187678.

The spelling of 123540829 in words is "one hundred twenty-three million, five hundred forty thousand, eight hundred twenty-nine".