308381 has 4 divisors (see below), whose sum is σ = 309600. Its totient is φ = 307164.

The previous prime is 308359. The next prime is 308383. The reversal of 308381 is 183803.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183803 = 41 ⋅4483.

It is a cyclic number.

It is not a de Polignac number, because 308381 - 2⁶ = 308317 is a prime.

It is a super-2 number, since 2×308381² = 190197682322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 308381.

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, 71 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (77400).

2³⁰⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

308381 is a deficient number, since it is larger than the sum of its proper divisors (1219).

308381 is an equidigital number, since it uses as much as digits as its factorization.

308381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 308381 is about 555.3206281060. The cubic root of 308381 is about 67.5609691474.

The spelling of 308381 in words is "three hundred eight thousand, three hundred eighty-one".