243640402 has 8 divisors (see below), whose sum is σ = 365705136. Its totient is φ = 121738692.

The previous prime is 243640399. The next prime is 243640427. The reversal of 243640402 is 204046342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36948 + ... + 43039.

It is an arithmetic number, because the mean of its divisors is an integer number (45713142).

Almost surely, 2^243640402 is an apocalyptic number.

243640402 is a deficient number, since it is larger than the sum of its proper divisors (122064734).

243640402 is a wasteful number, since it uses less digits than its factorization.

243640402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81512.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 243640402 is about 15608.9846562805. The cubic root of 243640402 is about 624.5728511767.

Adding to 243640402 its reverse (204046342), we get a palindrome (447686744).

The spelling of 243640402 in words is "two hundred forty-three million, six hundred forty thousand, four hundred two".