1285745669 has 8 divisors (see below), whose sum is σ = 1385045760. Its totient is φ = 1186502256.

The previous prime is 1285745651. The next prime is 1285745719. The reversal of 1285745669 is 9665475821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285745669 is a prime.

It is a super-2 number, since 2×1285745669² = 3306283850704515122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285745669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285745369) 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 7 ways as a sum of consecutive naturals, for example, 40904 + ... + 65150.

It is an arithmetic number, because the mean of its divisors is an integer number (173130720).

Almost surely, 2^1285745669 is an apocalyptic number.

It is an amenable number.

1285745669 is a deficient number, since it is larger than the sum of its proper divisors (99300091).

1285745669 is a wasteful number, since it uses less digits than its factorization.

1285745669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28339.

The product of its digits is 3628800, while the sum is 53.

The square root of 1285745669 is about 35857.2958963723. The cubic root of 1285745669 is about 1087.3892203006.

The spelling of 1285745669 in words is "one billion, two hundred eighty-five million, seven hundred forty-five thousand, six hundred sixty-nine".