4431999726 has 192 divisors, whose sum is σ = 12674188800. Its totient is φ = 1150692480.

The previous prime is 4431999709. The next prime is 4431999751. The reversal of 4431999726 is 6279991344.

4431999726 is a `hidden beast` number, since 443 + 1 + 99 + 97 + 26 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1832470 + ... + 1834886.

It is an arithmetic number, because the mean of its divisors is an integer number (66011400).

Almost surely, 2^4431999726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4431999726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6337094400).

4431999726 is an abundant number, since it is smaller than the sum of its proper divisors (8242189074).

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

4431999726 is a wasteful number, since it uses less digits than its factorization.

4431999726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466 (or 2440 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 4431999726 is about 66573.2658504899. The cubic root of 4431999726 is about 1642.6053826174.

The spelling of 4431999726 in words is "four billion, four hundred thirty-one million, nine hundred ninety-nine thousand, seven hundred twenty-six".