783981 has 12 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 475080.

The previous prime is 783953. The next prime is 784009. The reversal of 783981 is 189387.

It is an interprime number because it is at equal distance from previous prime (783953) and next prime (784009).

It is not a de Polignac number, because 783981 - 2¹⁴ = 767597 is a prime.

It is a super-2 number, since 2×783981² = 1229252416722, 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 783981.

It is not an unprimeable number, because it can be changed into a prime (783931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3861 + ... + 4058.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2⁷⁸³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

783981 is a deficient number, since it is larger than the sum of its proper divisors (451539).

783981 is a wasteful number, since it uses less digits than its factorization.

783981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936 (or 7933 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 783981 is about 885.4270156258. The cubic root of 783981 is about 92.2079809517.

It can be divided in two parts, 783 and 981, that added together give a square (1764 = 42²).

The spelling of 783981 in words is "seven hundred eighty-three thousand, nine hundred eighty-one".