1285286138 has 16 divisors (see below), whose sum is σ = 2012532480. Its totient is φ = 614463696.

The previous prime is 1285286137. The next prime is 1285286143. The reversal of 1285286138 is 8316825821.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191231 + ... + 197837.

It is an arithmetic number, because the mean of its divisors is an integer number (125783280).

Almost surely, 2^1285286138 is an apocalyptic number.

1285286138 is a deficient number, since it is larger than the sum of its proper divisors (727246342).

1285286138 is a wasteful number, since it uses less digits than its factorization.

1285286138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861.

The product of its digits is 184320, while the sum is 44.

The square root of 1285286138 is about 35850.8875482881. The cubic root of 1285286138 is about 1087.2596590118.

The spelling of 1285286138 in words is "one billion, two hundred eighty-five million, two hundred eighty-six thousand, one hundred thirty-eight".