243021402 has 48 divisors (see below), whose sum is σ = 582396360. Its totient is φ = 72752256.

The previous prime is 243021397. The next prime is 243021403. The reversal of 243021402 is 204120342.

243021402 is a `hidden beast` number, since 243 + 0 + 21 + 402 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 172108161 + 70913241 = 13119^2 + 8421^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (243021403) 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, 5377 + ... + 22692.

Almost surely, 2^243021402 is an apocalyptic number.

243021402 is an abundant number, since it is smaller than the sum of its proper divisors (339374958).

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

243021402 is a wasteful number, since it uses less digits than its factorization.

243021402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28127 (or 28124 counting only the distinct ones).

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

The square root of 243021402 is about 15589.1437224756. The cubic root of 243021402 is about 624.0434665234.

Adding to 243021402 its reverse (204120342), we get a palindrome (447141744).

It can be divided in two parts, 2430 and 21402, that added together give a palindrome (23832).

The spelling of 243021402 in words is "two hundred forty-three million, twenty-one thousand, four hundred two".