1285739642 has 16 divisors (see below), whose sum is σ = 2106000000. Its totient is φ = 583854240.

The previous prime is 1285739617. The next prime is 1285739647. The reversal of 1285739642 is 2469375821.

It is not an unprimeable number, because it can be changed into a prime (1285739647) 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, 5267 + ... + 50982.

It is an arithmetic number, because the mean of its divisors is an integer number (131625000).

Almost surely, 2^1285739642 is an apocalyptic number.

1285739642 is a deficient number, since it is larger than the sum of its proper divisors (820260358).

1285739642 is a wasteful number, since it uses less digits than its factorization.

1285739642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57301.

The product of its digits is 725760, while the sum is 47.

The square root of 1285739642 is about 35857.2118547999. The cubic root of 1285739642 is about 1087.3875212334.

The spelling of 1285739642 in words is "one billion, two hundred eighty-five million, seven hundred thirty-nine thousand, six hundred forty-two".