1284943945 has 4 divisors (see below), whose sum is σ = 1541932740. Its totient is φ = 1027955152.

The previous prime is 1284943943. The next prime is 1284944009. The reversal of 1284943945 is 5493494821.

It is a happy number.

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 1017163449 + 267780496 = 31893^2 + 16364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284943945 - 2¹ = 1284943943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1284943943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128494390 + ... + 128494399.

It is an arithmetic number, because the mean of its divisors is an integer number (385483185).

Almost surely, 2^1284943945 is an apocalyptic number.

It is an amenable number.

1284943945 is a deficient number, since it is larger than the sum of its proper divisors (256988795).

1284943945 is an equidigital number, since it uses as much as digits as its factorization.

1284943945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256988794.

The product of its digits is 1244160, while the sum is 49.

The square root of 1284943945 is about 35846.1147824977. The cubic root of 1284943945 is about 1087.1631602228.

The spelling of 1284943945 in words is "one billion, two hundred eighty-four million, nine hundred forty-three thousand, nine hundred forty-five".