243140402 has 4 divisors (see below), whose sum is σ = 364710606. Its totient is φ = 121570200.

The previous prime is 243140371. The next prime is 243140407. The reversal of 243140402 is 204041342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 231313681 + 11826721 = 15209^2 + 3439^2 .

It is not an unprimeable number, because it can be changed into a prime (243140407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60785099 + ... + 60785102.

Almost surely, 2^243140402 is an apocalyptic number.

243140402 is a deficient number, since it is larger than the sum of its proper divisors (121570204).

243140402 is a wasteful number, since it uses less digits than its factorization.

243140402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121570203.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243140402 is about 15592.9600140576. The cubic root of 243140402 is about 624.1453081089.

Adding to 243140402 its reverse (204041342), we get a palindrome (447181744).

The spelling of 243140402 in words is "two hundred forty-three million, one hundred forty thousand, four hundred two".