1285706945 has 4 divisors (see below), whose sum is σ = 1542848340. Its totient is φ = 1028565552.

The previous prime is 1285706921. The next prime is 1285706959. The reversal of 1285706945 is 5496075821.

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 1019397184 + 266309761 = 31928^2 + 16319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285706945 - 2⁸ = 1285706689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285706945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128570690 + ... + 128570699.

It is an arithmetic number, because the mean of its divisors is an integer number (385712085).

Almost surely, 2^1285706945 is an apocalyptic number.

It is an amenable number.

1285706945 is a deficient number, since it is larger than the sum of its proper divisors (257141395).

1285706945 is an equidigital number, since it uses as much as digits as its factorization.

1285706945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257141394.

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 1285706945 is about 35856.7559185156. The cubic root of 1285706945 is about 1087.3783035530.

The spelling of 1285706945 in words is "one billion, two hundred eighty-five million, seven hundred six thousand, nine hundred forty-five".