4999861 has 8 divisors (see below), whose sum is σ = 5271480. Its totient is φ = 4734912.

The previous prime is 4999849. The next prime is 4999867. The reversal of 4999861 is 1689994.

It can be written as a sum of positive squares in 4 ways, for example, as 2954961 + 2044900 = 1719^2 + 1430^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4999861 - 2⁷ = 4999733 is a prime.

It is a super-2 number, since 2×4999861² = 49997220038642, which contains 22 as substring.

It is a Duffinian number.

4999861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4999867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (658935).

Almost surely, 2^4999861 is an apocalyptic number.

It is an amenable number.

4999861 is a deficient number, since it is larger than the sum of its proper divisors (271619).

4999861 is a wasteful number, since it uses less digits than its factorization.

4999861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335.

The product of its digits is 139968, while the sum is 46.

The square root of 4999861 is about 2236.0368959389. The cubic root of 4999861 is about 170.9960100753.

The spelling of 4999861 in words is "four million, nine hundred ninety-nine thousand, eight hundred sixty-one".