4243949780 has 54 divisors (see below), whose sum is σ = 10372347342. Its totient is φ = 1454369280.

The previous prime is 4243949779. The next prime is 4243949789. The reversal of 4243949780 is 879493424.

It can be written as a sum of positive squares in 3 ways, for example, as 166616464 + 4077333316 = 12908^2 + 63854^2 .

It is a super-2 number, since 2×4243949780² = 36022219470324096800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243949789) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2038340 + ... + 2040420.

Almost surely, 2^4243949780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4243949780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5186173671).

4243949780 is an abundant number, since it is smaller than the sum of its proper divisors (6128397562).

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

4243949780 is an equidigital number, since it uses as much as digits as its factorization.

4243949780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The square root of 4243949780 is about 65145.6044564789. The cubic root of 4243949780 is about 1619.0368938788.

The spelling of 4243949780 in words is "four billion, two hundred forty-three million, nine hundred forty-nine thousand, seven hundred eighty".