13040643 has 16 divisors (see below), whose sum is σ = 21678336. Its totient is φ = 6774240.

The previous prime is 13040639. The next prime is 13040659. The reversal of 13040643 is 34604031.

13040643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13040643 - 2² = 13040639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (13040603) 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, 27996 + ... + 28457.

It is an arithmetic number, because the mean of its divisors is an integer number (1354896).

Almost surely, 2^13040643 is an apocalyptic number.

13040643 is a deficient number, since it is larger than the sum of its proper divisors (8637693).

13040643 is a wasteful number, since it uses less digits than its factorization.

13040643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56474.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 13040643 is about 3611.1830471467. The cubic root of 13040643 is about 235.3782530722.

Adding to 13040643 its reverse (34604031), we get a palindrome (47644674).

The spelling of 13040643 in words is "thirteen million, forty thousand, six hundred forty-three".