1306656642 has 8 divisors (see below), whose sum is σ = 2613313296. Its totient is φ = 435552212.

The previous prime is 1306656641. The next prime is 1306656649. The reversal of 1306656642 is 2466566031.

It is a sphenic number, since it is the product of 3 distinct primes.

1306656642 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1306656642.

It is not an unprimeable number, because it can be changed into a prime (1306656641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108888048 + ... + 108888059.

It is an arithmetic number, because the mean of its divisors is an integer number (326664162).

Almost surely, 2^1306656642 is an apocalyptic number.

1306656642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1306656642 is a wasteful number, since it uses less digits than its factorization.

1306656642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217776112.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 1306656642 is about 36147.7059023114. The cubic root of 1306656642 is about 1093.2525360636.

The spelling of 1306656642 in words is "one billion, three hundred six million, six hundred fifty-six thousand, six hundred forty-two".