308643 has 4 divisors (see below), whose sum is σ = 411528. Its totient is φ = 205760.

The previous prime is 308641. The next prime is 308663. The reversal of 308643 is 346803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346803 = 3 ⋅115601.

It is a cyclic number.

It is not a de Polignac number, because 308643 - 2¹ = 308641 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (308641) 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, 51438 + ... + 51443.

It is an arithmetic number, because the mean of its divisors is an integer number (102882).

2³⁰⁸⁶⁴³ is an apocalyptic number.

308643 is a deficient number, since it is larger than the sum of its proper divisors (102885).

308643 is a wasteful number, since it uses less digits than its factorization.

308643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102884.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 308643 is about 555.5564777770. The cubic root of 308643 is about 67.5800969615.

The spelling of 308643 in words is "three hundred eight thousand, six hundred forty-three".