31804 has 6 divisors (see below), whose sum is σ = 55664. Its totient is φ = 15900.

The previous prime is 31799. The next prime is 31817. The reversal of 31804 is 40813.

It is a super-2 number, since 2×31804² = 2022988832, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a zygodrome in base 2.

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 31804.

It is an unprimeable number.

31804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3972 + ... + 3979.

2³¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

31804 is a deficient number, since it is larger than the sum of its proper divisors (23860).

31804 is a wasteful number, since it uses less digits than its factorization.

31804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7955 (or 7953 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31804 is about 178.3367600917. The cubic root of 31804 is about 31.6830693724.

Subtracting 31804 from its reverse (40813), we obtain a palindrome (9009).

It can be divided in two parts, 3180 and 4, that multiplied together give a triangular number (12720 = T₁₅₉).

The spelling of 31804 in words is "thirty-one thousand, eight hundred four".