1245305405 has 4 divisors (see below), whose sum is σ = 1494366492. Its totient is φ = 996244320.

The previous prime is 1245305401. The next prime is 1245305417. The reversal of 1245305405 is 5045035421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045035421 = 3877 ⋅1301273.

It can be written as a sum of positive squares in 2 ways, for example, as 608954329 + 636351076 = 24677^2 + 25226^2 .

It is not a de Polignac number, because 1245305405 - 2² = 1245305401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245305401) 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 in 3 ways as a sum of consecutive naturals, for example, 124530536 + ... + 124530545.

It is an arithmetic number, because the mean of its divisors is an integer number (373591623).

Almost surely, 2^1245305405 is an apocalyptic number.

It is an amenable number.

1245305405 is a deficient number, since it is larger than the sum of its proper divisors (249061087).

1245305405 is an equidigital number, since it uses as much as digits as its factorization.

1245305405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249061086.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1245305405 is about 35288.8850064719. The cubic root of 1245305405 is about 1075.8670934569.

The spelling of 1245305405 in words is "one billion, two hundred forty-five million, three hundred five thousand, four hundred five".