303981 has 8 divisors (see below), whose sum is σ = 426720. Its totient is φ = 191952.

The previous prime is 303959. The next prime is 303983. The reversal of 303981 is 189303.

303981 is nontrivially palindromic in base 15.

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

It is not a de Polignac number, because 303981 - 2⁶ = 303917 is a prime.

It is a super-2 number, since 2×303981² = 184808896722, which contains 22 as substring.

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 303981.

It is not an unprimeable number, because it can be changed into a prime (303983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2610 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (53340).

2³⁰³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

303981 is a deficient number, since it is larger than the sum of its proper divisors (122739).

303981 is a wasteful number, since it uses less digits than its factorization.

303981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 303981 is about 551.3447197534. The cubic root of 303981 is about 67.2381072837.

The spelling of 303981 in words is "three hundred three thousand, nine hundred eighty-one".