243636401 has 16 divisors (see below), whose sum is σ = 270635904. Its totient is φ = 218152704.

The previous prime is 243636377. The next prime is 243636431. The reversal of 243636401 is 104636342.

It is not a de Polignac number, because 243636401 - 2¹⁴ = 243620017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243636431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75446 + ... + 78608.

It is an arithmetic number, because the mean of its divisors is an integer number (16914744).

Almost surely, 2^243636401 is an apocalyptic number.

It is an amenable number.

243636401 is a deficient number, since it is larger than the sum of its proper divisors (26999503).

243636401 is a wasteful number, since it uses less digits than its factorization.

243636401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 243636401 is about 15608.8564923892. The cubic root of 243636401 is about 624.5694322998.

The spelling of 243636401 in words is "two hundred forty-three million, six hundred thirty-six thousand, four hundred one".