4009813 has 4 divisors (see below), whose sum is σ = 4058208. Its totient is φ = 3961420.

The previous prime is 4009799. The next prime is 4009823. The reversal of 4009813 is 3189004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4009813 - 2⁵ = 4009781 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24073 + ... + 24238.

It is an arithmetic number, because the mean of its divisors is an integer number (1014552).

Almost surely, 2^4009813 is an apocalyptic number.

It is an amenable number.

4009813 is a deficient number, since it is larger than the sum of its proper divisors (48395).

4009813 is an equidigital number, since it uses as much as digits as its factorization.

4009813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48394.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 4009813 is about 2002.4517472339. The cubic root of 4009813 is about 158.8698089104.

The spelling of 4009813 in words is "four million, nine thousand, eight hundred thirteen".