1245378305 has 4 divisors (see below), whose sum is σ = 1494453972. Its totient is φ = 996302640.

The previous prime is 1245378293. The next prime is 1245378307. The reversal of 1245378305 is 5038735421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 628153969 + 617224336 = 25063^2 + 24844^2 .

It is not a de Polignac number, because 1245378305 - 2¹⁶ = 1245312769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245378307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124537826 + ... + 124537835.

It is an arithmetic number, because the mean of its divisors is an integer number (373613493).

Almost surely, 2^1245378305 is an apocalyptic number.

It is an amenable number.

1245378305 is a deficient number, since it is larger than the sum of its proper divisors (249075667).

1245378305 is an equidigital number, since it uses as much as digits as its factorization.

1245378305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249075666.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 1245378305 is about 35289.9178944922. The cubic root of 1245378305 is about 1075.8880867491. Note that the first 3 decimals are identical.

The spelling of 1245378305 in words is "one billion, two hundred forty-five million, three hundred seventy-eight thousand, three hundred five".