13040042 has 12 divisors (see below), whose sum is σ = 20644866. Its totient is φ = 6176520.

The previous prime is 13040029. The next prime is 13040059. The reversal of 13040042 is 24004031.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 3682561 = 3059^2 + 1919^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13039999 and 13040026.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8309 + ... + 9752.

Almost surely, 2^13040042 is an apocalyptic number.

13040042 is a deficient number, since it is larger than the sum of its proper divisors (7604824).

13040042 is a wasteful number, since it uses less digits than its factorization.

13040042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18101 (or 18082 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 13040042 is about 3611.0998324610. The cubic root of 13040042 is about 235.3746370822.

Adding to 13040042 its reverse (24004031), we get a palindrome (37044073).

The spelling of 13040042 in words is "thirteen million, forty thousand, forty-two".