13003861 has 16 divisors (see below), whose sum is σ = 15346800. Its totient is φ = 10902528.

The previous prime is 13003841. The next prime is 13003877. The reversal of 13003861 is 16830031.

13003861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1232100 + 11771761 = 1110^2 + 3431^2 .

It is not a de Polignac number, because 13003861 - 2¹⁵ = 12971093 is a prime.

13003861 is a modest number, since divided by 3861 gives 13 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13003801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5395 + ... + 7423.

It is an arithmetic number, because the mean of its divisors is an integer number (959175).

Almost surely, 2^13003861 is an apocalyptic number.

It is an amenable number.

13003861 is a deficient number, since it is larger than the sum of its proper divisors (2342939).

13003861 is a wasteful number, since it uses less digits than its factorization.

13003861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 13003861 is about 3606.0866600790. The cubic root of 13003861 is about 235.1567446813.

Adding to 13003861 its reverse (16830031), we get a palindrome (29833892).

The spelling of 13003861 in words is "thirteen million, three thousand, eight hundred sixty-one".