243427493 has 4 divisors (see below), whose sum is σ = 243521568. Its totient is φ = 243333420.

The previous prime is 243427453. The next prime is 243427501. The reversal of 243427493 is 394724342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 394724342 = 2 ⋅197362171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243427493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243427453) 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, 43043 + ... + 48368.

It is an arithmetic number, because the mean of its divisors is an integer number (60880392).

Almost surely, 2^243427493 is an apocalyptic number.

It is an amenable number.

243427493 is a deficient number, since it is larger than the sum of its proper divisors (94075).

243427493 is an equidigital number, since it uses as much as digits as its factorization.

243427493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94074.

The product of its digits is 145152, while the sum is 38.

The square root of 243427493 is about 15602.1630872133. The cubic root of 243427493 is about 624.3908672178.

The spelling of 243427493 in words is "two hundred forty-three million, four hundred twenty-seven thousand, four hundred ninety-three".