1305249807 has 4 divisors (see below), whose sum is σ = 1740333080. Its totient is φ = 870166536.

The previous prime is 1305249733. The next prime is 1305249811. The reversal of 1305249807 is 7089425031.

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

It is not a de Polignac number, because 1305249807 - 2¹⁹ = 1304725519 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 (1305249877) 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, 217541632 + ... + 217541637.

It is an arithmetic number, because the mean of its divisors is an integer number (435083270).

Almost surely, 2^1305249807 is an apocalyptic number.

1305249807 is a deficient number, since it is larger than the sum of its proper divisors (435083273).

1305249807 is an equidigital number, since it uses as much as digits as its factorization.

1305249807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435083272.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1305249807 is about 36128.2411279597. The cubic root of 1305249807 is about 1092.8600386026.

The spelling of 1305249807 in words is "one billion, three hundred five million, two hundred forty-nine thousand, eight hundred seven".