803981 has 4 divisors (see below), whose sum is σ = 851292. Its totient is φ = 756672.

The previous prime is 803977. The next prime is 803987. The reversal of 803981 is 189308.

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 2 ways, for example, as 538756 + 265225 = 734^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 803981 - 2² = 803977 is a prime.

It is a super-2 number, since 2×803981² = 1292770896722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (803987) 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, 23630 + ... + 23663.

It is an arithmetic number, because the mean of its divisors is an integer number (212823).

2⁸⁰³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

803981 is a deficient number, since it is larger than the sum of its proper divisors (47311).

803981 is a wasteful number, since it uses less digits than its factorization.

803981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47310.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 803981 is about 896.6498759271. The cubic root of 803981 is about 92.9855066635.

The spelling of 803981 in words is "eight hundred three thousand, nine hundred eighty-one".