243640404 has 72 divisors (see below), whose sum is σ = 705344640. Its totient is φ = 69463872.

The previous prime is 243640399. The next prime is 243640427. The reversal of 243640404 is 404046342.

It is a super-2 number, since 2×243640404² = 118721292922566432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184057 + ... + 185375.

Almost surely, 2^243640404 is an apocalyptic number.

It is an amenable number.

243640404 is an abundant number, since it is smaller than the sum of its proper divisors (461704236).

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

243640404 is a wasteful number, since it uses less digits than its factorization.

243640404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069 (or 2064 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 243640404 is about 15608.9847203462. The cubic root of 243640404 is about 624.5728528857.

Adding to 243640404 its reverse (404046342), we get a palindrome (647686746).

The spelling of 243640404 in words is "two hundred forty-three million, six hundred forty thousand, four hundred four".