243249407 has 4 divisors (see below), whose sum is σ = 243856416. Its totient is φ = 242642400.

The previous prime is 243249397. The next prime is 243249431. The reversal of 243249407 is 704942342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243249407 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 (243249497) 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, 302903 + ... + 303704.

It is an arithmetic number, because the mean of its divisors is an integer number (60964104).

Almost surely, 2^243249407 is an apocalyptic number.

243249407 is a deficient number, since it is larger than the sum of its proper divisors (607009).

243249407 is an equidigital number, since it uses as much as digits as its factorization.

243249407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607008.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 243249407 is about 15596.4549497634. The cubic root of 243249407 is about 624.2385667010.

The spelling of 243249407 in words is "two hundred forty-three million, two hundred forty-nine thousand, four hundred seven".