13543403 has 4 divisors (see below), whose sum is σ = 13765488. Its totient is φ = 13321320.

The previous prime is 13543399. The next prime is 13543417. The reversal of 13543403 is 30434531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30434531 = 877 ⋅34703.

It is a cyclic number.

It is not a de Polignac number, because 13543403 - 2² = 13543399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13543423) 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, 110951 + ... + 111072.

It is an arithmetic number, because the mean of its divisors is an integer number (3441372).

Almost surely, 2^13543403 is an apocalyptic number.

13543403 is a deficient number, since it is larger than the sum of its proper divisors (222085).

13543403 is an equidigital number, since it uses as much as digits as its factorization.

13543403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222084.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 13543403 is about 3680.1362746507. The cubic root of 13543403 is about 238.3650624728.

Adding to 13543403 its reverse (30434531), we get a palindrome (43977934).

The spelling of 13543403 in words is "thirteen million, five hundred forty-three thousand, four hundred three".