243542403 has 32 divisors (see below), whose sum is σ = 389491200. Its totient is φ = 149512608.

The previous prime is 243542363. The next prime is 243542407. The reversal of 243542403 is 304245342.

It is not a de Polignac number, because 243542403 - 2¹³ = 243534211 is a prime.

It is a super-3 number, since 3×243542403³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (243542407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289858 + ... + 290696.

It is an arithmetic number, because the mean of its divisors is an integer number (12171600).

Almost surely, 2^243542403 is an apocalyptic number.

243542403 is a deficient number, since it is larger than the sum of its proper divisors (145948797).

243542403 is a wasteful number, since it uses less digits than its factorization.

243542403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

The square root of 243542403 is about 15605.8451549411. The cubic root of 243542403 is about 624.4890997099.

Adding to 243542403 its reverse (304245342), we get a palindrome (547787745).

The spelling of 243542403 in words is "two hundred forty-three million, five hundred forty-two thousand, four hundred three".