104400721 has 2 divisors, whose sum is σ = 104400722. Its totient is φ = 104400720.

The previous prime is 104400683. The next prime is 104400733. The reversal of 104400721 is 127004401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97298496 + 7102225 = 9864^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 104400721 - 2¹⁵ = 104367953 is a prime.

It is not a weakly prime, because it can be changed into another prime (104403721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52200360 + 52200361.

It is an arithmetic number, because the mean of its divisors is an integer number (52200361).

Almost surely, 2^104400721 is an apocalyptic number.

It is an amenable number.

104400721 is a deficient number, since it is larger than the sum of its proper divisors (1).

104400721 is an equidigital number, since it uses as much as digits as its factorization.

104400721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 104400721 is about 10217.6671016431. The cubic root of 104400721 is about 470.8701565235.

The spelling of 104400721 in words is "one hundred four million, four hundred thousand, seven hundred twenty-one".