243734399 has 4 divisors (see below), whose sum is σ = 243788760. Its totient is φ = 243680040.

The previous prime is 243734377. The next prime is 243734411. The reversal of 243734399 is 993437342.

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-243734399 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 (243734999) 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, 19784 + ... + 29645.

It is an arithmetic number, because the mean of its divisors is an integer number (60947190).

Almost surely, 2^243734399 is an apocalyptic number.

243734399 is a deficient number, since it is larger than the sum of its proper divisors (54361).

243734399 is an equidigital number, since it uses as much as digits as its factorization.

243734399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54360.

The product of its digits is 489888, while the sum is 44.

The square root of 243734399 is about 15611.9953561356. The cubic root of 243734399 is about 624.6531613737.

The spelling of 243734399 in words is "two hundred forty-three million, seven hundred thirty-four thousand, three hundred ninety-nine".