243126857 has 8 divisors (see below), whose sum is σ = 245088000. Its totient is φ = 241173504.

The previous prime is 243126839. The next prime is 243126887. The reversal of 243126857 is 758621342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243126857 - 2¹⁶ = 243061321 is a prime.

It is a super-2 number, since 2×243126857² = 118221337189396898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243126857.

It is not an unprimeable number, because it can be changed into a prime (243126887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71369 + ... + 74697.

It is an arithmetic number, because the mean of its divisors is an integer number (30636000).

Almost surely, 2^243126857 is an apocalyptic number.

It is an amenable number.

243126857 is a deficient number, since it is larger than the sum of its proper divisors (1961143).

243126857 is a wasteful number, since it uses less digits than its factorization.

243126857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895.

The product of its digits is 80640, while the sum is 38.

The square root of 243126857 is about 15592.5256773879. The cubic root of 243126857 is about 624.1337178164.

The spelling of 243126857 in words is "two hundred forty-three million, one hundred twenty-six thousand, eight hundred fifty-seven".