308642 has 4 divisors (see below), whose sum is σ = 462966. Its totient is φ = 154320.

The previous prime is 308641. The next prime is 308663. The reversal of 308642 is 246803.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 303601 + 5041 = 551^2 + 71^2 .

It is an Ulam 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 as a sum of consecutive naturals, namely, 77159 + ... + 77162.

2³⁰⁸⁶⁴² is an apocalyptic number.

308642 is a deficient number, since it is larger than the sum of its proper divisors (154324).

308642 is a wasteful number, since it uses less digits than its factorization.

308642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154323.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 308642 is about 555.5555777778. Note that the first 4 decimals coincide. The cubic root of 308642 is about 67.5800239752.

The spelling of 308642 in words is "three hundred eight thousand, six hundred forty-two".