4243856640 has 72 divisors (see below), whose sum is σ = 13553829408. Its totient is φ = 1131694080.

The previous prime is 4243856609. The next prime is 4243856653. The reversal of 4243856640 is 466583424.

It is a junction number, because it is equal to n+sod(n) for n = 4243856592 and 4243856601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548746 + ... + 556425.

Almost surely, 2^4243856640 is an apocalyptic number.

4243856640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4243856640 is an abundant number, since it is smaller than the sum of its proper divisors (9309972768).

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

4243856640 is a wasteful number, since it uses less digits than its factorization.

4243856640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105195 (or 1105181 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

The square root of 4243856640 is about 65144.8895923541. The cubic root of 4243856640 is about 1619.0250497079.

The spelling of 4243856640 in words is "four billion, two hundred forty-three million, eight hundred fifty-six thousand, six hundred forty".