243897861 has 8 divisors (see below), whose sum is σ = 344326464. Its totient is φ = 153033920.

The previous prime is 243897839. The next prime is 243897869. The reversal of 243897861 is 168798342.

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 243897861 - 2²¹ = 241800709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243897861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243897869) 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, 2391105 + ... + 2391206.

It is an arithmetic number, because the mean of its divisors is an integer number (43040808).

Almost surely, 2^243897861 is an apocalyptic number.

It is an amenable number.

243897861 is a deficient number, since it is larger than the sum of its proper divisors (100428603).

243897861 is a wasteful number, since it uses less digits than its factorization.

243897861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782331.

The product of its digits is 580608, while the sum is 48.

The square root of 243897861 is about 15617.2296198782. The cubic root of 243897861 is about 624.7927726852.

The spelling of 243897861 in words is "two hundred forty-three million, eight hundred ninety-seven thousand, eight hundred sixty-one".