13540642 has 4 divisors (see below), whose sum is σ = 20310966. Its totient is φ = 6770320.

The previous prime is 13540627. The next prime is 13540643. The reversal of 13540642 is 24604531.

13540642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24604531 = 7 ⋅3514933.

It can be written as a sum of positive squares in only one way, i.e., 9126441 + 4414201 = 3021^2 + 2101^2 .

It is not an unprimeable number, because it can be changed into a prime (13540643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3385159 + ... + 3385162.

Almost surely, 2^13540642 is an apocalyptic number.

13540642 is a deficient number, since it is larger than the sum of its proper divisors (6770324).

13540642 is an equidigital number, since it uses as much as digits as its factorization.

13540642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770323.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 13540642 is about 3679.7611335520. The cubic root of 13540642 is about 238.3488634258.

The spelling of 13540642 in words is "thirteen million, five hundred forty thousand, six hundred forty-two".