2443923781 has 16 divisors (see below), whose sum is σ = 2720747008. Its totient is φ = 2180001600.

The previous prime is 2443923761. The next prime is 2443923793. The reversal of 2443923781 is 1873293442.

It is a cyclic number.

It is not a de Polignac number, because 2443923781 - 2¹³ = 2443915589 is a prime.

It is a super-2 number, since 2×2443923781² = 11945526894674671922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443923761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301066 + ... + 309076.

It is an arithmetic number, because the mean of its divisors is an integer number (170046688).

Almost surely, 2^2443923781 is an apocalyptic number.

It is an amenable number.

2443923781 is a deficient number, since it is larger than the sum of its proper divisors (276823227).

2443923781 is a wasteful number, since it uses less digits than its factorization.

2443923781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8812.

The product of its digits is 290304, while the sum is 43.

The square root of 2443923781 is about 49436.0574985506. The cubic root of 2443923781 is about 1346.9843579941.

The spelling of 2443923781 in words is "two billion, four hundred forty-three million, nine hundred twenty-three thousand, seven hundred eighty-one".