1285286139 has 12 divisors (see below), whose sum is σ = 1965731976. Its totient is φ = 806453952.

The previous prime is 1285286137. The next prime is 1285286143. The reversal of 1285286139 is 9316825821.

1285286139 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 28 + 613 + 9 = 666.

It is not a de Polignac number, because 1285286139 - 2¹ = 1285286137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1285286094 and 1285286103.

It is not an unprimeable number, because it can be changed into a prime (1285286137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4200129 + ... + 4200434.

It is an arithmetic number, because the mean of its divisors is an integer number (163810998).

Almost surely, 2^1285286139 is an apocalyptic number.

1285286139 is a deficient number, since it is larger than the sum of its proper divisors (680445837).

1285286139 is a wasteful number, since it uses less digits than its factorization.

1285286139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8400586 (or 8400583 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1285286139 is about 35850.8875622348. The cubic root of 1285286139 is about 1087.2596592938.

The spelling of 1285286139 in words is "one billion, two hundred eighty-five million, two hundred eighty-six thousand, one hundred thirty-nine".