40306 has 8 divisors (see below), whose sum is σ = 69120. Its totient is φ = 17268.

The previous prime is 40289. The next prime is 40343. The reversal of 40306 is 60304.

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

It is an Ulam number.

It is an unprimeable number.

40306 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (8640).

2⁴⁰³⁰⁶ is an apocalyptic number.

40306 is a deficient number, since it is larger than the sum of its proper divisors (28814).

40306 is a wasteful number, since it uses less digits than its factorization.

40306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40306 is about 200.7635425071. The cubic root of 40306 is about 34.2865062648.

The spelling of 40306 in words is "forty thousand, three hundred six".