123540401 has 2 divisors, whose sum is σ = 123540402. Its totient is φ = 123540400.

The previous prime is 123540397. The next prime is 123540407. The reversal of 123540401 is 104045321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 3418801 = 10960^2 + 1849^2 .

It is a cyclic number.

It is not a de Polignac number, because 123540401 - 2² = 123540397 is a prime.

It is not a weakly prime, because it can be changed into another prime (123540407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61770200 + 61770201.

It is an arithmetic number, because the mean of its divisors is an integer number (61770201).

Almost surely, 2^123540401 is an apocalyptic number.

It is an amenable number.

123540401 is a deficient number, since it is larger than the sum of its proper divisors (1).

123540401 is an equidigital number, since it uses as much as digits as its factorization.

123540401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 123540401 is about 11114.8729637365. The cubic root of 123540401 is about 498.0462436157.

Adding to 123540401 its reverse (104045321), we get a palindrome (227585722).

The spelling of 123540401 in words is "one hundred twenty-three million, five hundred forty thousand, four hundred one".