4981809 has 16 divisors (see below), whose sum is σ = 7717760. Its totient is φ = 2799360.

The previous prime is 4981807. The next prime is 4981811. The reversal of 4981809 is 9081894.

It is an interprime number because it is at equal distance from previous prime (4981807) and next prime (4981811).

It is not a de Polignac number, because 4981809 - 2¹ = 4981807 is a prime.

It is a Duffinian number.

4981809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4981807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664 + ... + 3225.

It is an arithmetic number, because the mean of its divisors is an integer number (482360).

Almost surely, 2^4981809 is an apocalyptic number.

It is an amenable number.

4981809 is a deficient number, since it is larger than the sum of its proper divisors (2735951).

4981809 is a wasteful number, since it uses less digits than its factorization.

4981809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 4981809 is about 2231.9966397824. The cubic root of 4981809 is about 170.7899681852.

The spelling of 4981809 in words is "four million, nine hundred eighty-one thousand, eight hundred nine".