243189493 has 32 divisors (see below), whose sum is σ = 274803840. Its totient is φ = 214306560.

The previous prime is 243189487. The next prime is 243189503. The reversal of 243189493 is 394981342.

It is not a de Polignac number, because 243189493 - 2²⁵ = 209635061 is a prime.

It is a super-2 number, since 2×243189493² = 118282259011194098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243189433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2272746 + ... + 2272852.

It is an arithmetic number, because the mean of its divisors is an integer number (8587620).

Almost surely, 2^243189493 is an apocalyptic number.

It is an amenable number.

243189493 is a deficient number, since it is larger than the sum of its proper divisors (31614347).

243189493 is a wasteful number, since it uses less digits than its factorization.

243189493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its digits is 186624, while the sum is 43.

The square root of 243189493 is about 15594.5340744762. The cubic root of 243189493 is about 624.1873110768.

The spelling of 243189493 in words is "two hundred forty-three million, one hundred eighty-nine thousand, four hundred ninety-three".