243210042 has 12 divisors (see below), whose sum is σ = 526955130. Its totient is φ = 81070008.

The previous prime is 243210031. The next prime is 243210047. The reversal of 243210042 is 240012342.

It can be written as a sum of positive squares in only one way, i.e., 212838921 + 30371121 = 14589^2 + 5511^2 .

It is a super-2 number, since 2×243210042² = 118302249059283528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 13511669 = 243210042 / (2 + 4 + 3 + 2 + 1 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 243209997 and 243210024.

It is not an unprimeable number, because it can be changed into a prime (243210047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6755817 + ... + 6755852.

Almost surely, 2^243210042 is an apocalyptic number.

243210042 is an abundant number, since it is smaller than the sum of its proper divisors (283745088).

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

243210042 is a wasteful number, since it uses less digits than its factorization.

243210042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13511677 (or 13511674 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243210042 is about 15595.1929132025. The cubic root of 243210042 is about 624.2048914194.

Adding to 243210042 its reverse (240012342), we get a palindrome (483222384).

The spelling of 243210042 in words is "two hundred forty-three million, two hundred ten thousand, forty-two".