263981306 has 8 divisors (see below), whose sum is σ = 408745344. Its totient is φ = 127732860.

The previous prime is 263981299. The next prime is 263981309. The reversal of 263981306 is 603189362.

263981306 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×263981306² = 139372259834931272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263981306.

It is not an unprimeable number, because it can be changed into a prime (263981309) 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, 2128820 + ... + 2128943.

It is an arithmetic number, because the mean of its divisors is an integer number (51093168).

Almost surely, 2^263981306 is an apocalyptic number.

263981306 is a deficient number, since it is larger than the sum of its proper divisors (144764038).

263981306 is a wasteful number, since it uses less digits than its factorization.

263981306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257796.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 263981306 is about 16247.5015310047. The cubic root of 263981306 is about 641.4917238118.

The spelling of 263981306 in words is "two hundred sixty-three million, nine hundred eighty-one thousand, three hundred six".