308389 has 4 divisors (see below), whose sum is σ = 324640. Its totient is φ = 292140.

The previous prime is 308383. The next prime is 308411. The reversal of 308389 is 983803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-308389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 308389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308383) 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, 8097 + ... + 8134.

It is an arithmetic number, because the mean of its divisors is an integer number (81160).

2³⁰⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

308389 is a deficient number, since it is larger than the sum of its proper divisors (16251).

308389 is a wasteful number, since it uses less digits than its factorization.

308389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16250.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 308389 is about 555.3278311052. The cubic root of 308389 is about 67.5615533631.

The spelling of 308389 in words is "three hundred eight thousand, three hundred eighty-nine".