1285911849 has 16 divisors (see below), whose sum is σ = 1809735680. Its totient is φ = 809928720.

The previous prime is 1285911827. The next prime is 1285911877. The reversal of 1285911849 is 9481195821.

It is a happy number.

It is not a de Polignac number, because 1285911849 - 2⁵ = 1285911817 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285911798 and 1285911807.

It is not an unprimeable number, because it can be changed into a prime (1285911149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9817 + ... + 51654.

It is an arithmetic number, because the mean of its divisors is an integer number (113108480).

Almost surely, 2^1285911849 is an apocalyptic number.

1285911849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1285911849 is a deficient number, since it is larger than the sum of its proper divisors (523823831).

1285911849 is a wasteful number, since it uses less digits than its factorization.

1285911849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61860.

The product of its digits is 207360, while the sum is 48.

The square root of 1285911849 is about 35859.6130626085. The cubic root of 1285911849 is about 1087.4360658939.

The spelling of 1285911849 in words is "one billion, two hundred eighty-five million, nine hundred eleven thousand, eight hundred forty-nine".