243642492 has 72 divisors (see below), whose sum is σ = 641362176. Its totient is φ = 80874288.

The previous prime is 243642467. The next prime is 243642499. The reversal of 243642492 is 294246342.

243642492 is a `hidden beast` number, since 2 + 4 + 3 + 642 + 4 + 9 + 2 = 666.

243642492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243642499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356383 + ... + 357065.

It is an arithmetic number, because the mean of its divisors is an integer number (8907808).

Almost surely, 2^243642492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243642492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320681088).

243642492 is an abundant number, since it is smaller than the sum of its proper divisors (397719684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243642492 is a wasteful number, since it uses less digits than its factorization.

243642492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1055 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 243642492 is about 15609.0516047581. The cubic root of 243642492 is about 624.5746370786.

The spelling of 243642492 in words is "two hundred forty-three million, six hundred forty-two thousand, four hundred ninety-two".