243776385 has 24 divisors (see below), whose sum is σ = 438197760. Its totient is φ = 130013424.

The previous prime is 243776381. The next prime is 243776399. The reversal of 243776385 is 583677342.

243776385 is a `hidden beast` number, since 2 + 4 + 3 + 7 + 7 + 638 + 5 = 666.

It is not a de Polignac number, because 243776385 - 2² = 243776381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 243776385.

It is not an unprimeable number, because it can be changed into a prime (243776381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99105 + ... + 101534.

It is an arithmetic number, because the mean of its divisors is an integer number (18258240).

Almost surely, 2^243776385 is an apocalyptic number.

It is an amenable number.

243776385 is a deficient number, since it is larger than the sum of its proper divisors (194421375).

243776385 is an equidigital number, since it uses as much as digits as its factorization.

243776385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200659 (or 200647 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 243776385 is about 15613.3399693980. The cubic root of 243776385 is about 624.6890271658.

The spelling of 243776385 in words is "two hundred forty-three million, seven hundred seventy-six thousand, three hundred eighty-five".