243645457 has 16 divisors (see below), whose sum is σ = 270768960. Its totient is φ = 217382400.

The previous prime is 243645427. The next prime is 243645469. The reversal of 243645457 is 754546342.

It is a cyclic number.

It is not a de Polignac number, because 243645457 - 2¹⁵ = 243612689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243645427) 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, 192894 + ... + 194152.

It is an arithmetic number, because the mean of its divisors is an integer number (16923060).

Almost surely, 2^243645457 is an apocalyptic number.

It is an amenable number.

243645457 is a deficient number, since it is larger than the sum of its proper divisors (27123503).

243645457 is a wasteful number, since it uses less digits than its factorization.

243645457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584.

The product of its digits is 403200, while the sum is 40.

The square root of 243645457 is about 15609.1465814118. The cubic root of 243645457 is about 624.5771706491.

The spelling of 243645457 in words is "two hundred forty-three million, six hundred forty-five thousand, four hundred fifty-seven".