499681 has 24 divisors (see below), whose sum is σ = 687680. Its totient is φ = 352512.

The previous prime is 499679. The next prime is 499687. The reversal of 499681 is 186994.

It is not a de Polignac number, because 499681 - 2¹ = 499679 is a prime.

It is a super-2 number, since 2×499681² = 499362203522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 499681.

It is not an unprimeable number, because it can be changed into a prime (499687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26290 + ... + 26308.

2⁴⁹⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

499681 is a deficient number, since it is larger than the sum of its proper divisors (187999).

499681 is a wasteful number, since it uses less digits than its factorization.

499681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 56 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 499681 is about 706.8811781339. The cubic root of 499681 is about 79.3531696429.

It can be divided in two parts, 49 and 9681, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 499681 in words is "four hundred ninety-nine thousand, six hundred eighty-one".