243507897 has 16 divisors (see below), whose sum is σ = 369552960. Its totient is φ = 158378400.

The previous prime is 243507829. The next prime is 243507899. The reversal of 243507897 is 798705342.

243507897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243507897 - 2⁷ = 243507769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243507899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108879 + ... + 111092.

It is an arithmetic number, because the mean of its divisors is an integer number (23097060).

Almost surely, 2^243507897 is an apocalyptic number.

243507897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

243507897 is a deficient number, since it is larger than the sum of its proper divisors (126045063).

243507897 is a wasteful number, since it uses less digits than its factorization.

243507897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220021 (or 220015 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 243507897 is about 15604.7395684773. The cubic root of 243507897 is about 624.4596049985.

The spelling of 243507897 in words is "two hundred forty-three million, five hundred seven thousand, eight hundred ninety-seven".