1309656042 has 12 divisors (see below), whose sum is σ = 2837588130. Its totient is φ = 436552008.

The previous prime is 1309656017. The next prime is 1309656043. The reversal of 1309656042 is 2406569031.

It is a happy number.

1309656042 is a `hidden beast` number, since 1 + 3 + 0 + 96 + 560 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1309643721 + 12321 = 36189^2 + 111^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1309655988 and 1309656006.

It is not an unprimeable number, because it can be changed into a prime (1309656043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36379317 + ... + 36379352.

Almost surely, 2^1309656042 is an apocalyptic number.

1309656042 is an abundant number, since it is smaller than the sum of its proper divisors (1527932088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1309656042 is a wasteful number, since it uses less digits than its factorization.

1309656042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72758677 (or 72758674 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1309656042 is about 36189.1702308854. The cubic root of 1309656042 is about 1094.0884087563.

The spelling of 1309656042 in words is "one billion, three hundred nine million, six hundred fifty-six thousand, forty-two".