4434393640 has 24 divisors (see below), whose sum is σ = 9978333390. Its totient is φ = 1773588992.

The previous prime is 4434393599. The next prime is 4434393643. The reversal of 4434393640 is 463934344.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4359432676 + 74960964 = 66026^2 + 8658^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 4434393593 and 4434393602.

It is not an unprimeable number, because it can be changed into a prime (4434393643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415896 + ... + 426424.

Almost surely, 2^4434393640 is an apocalyptic number.

4434393640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4434393640 is an abundant number, since it is smaller than the sum of its proper divisors (5543939750).

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

4434393640 is an frugal number, since it uses more digits than its factorization.

4434393640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21069 (or 10536 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 40.

The square root of 4434393640 is about 66591.2429678257. The cubic root of 4434393640 is about 1642.9010766971.

Multiplying 4434393640 by its sum of digits (40), we get a square (177375745600 = 421160²).

4434393640 divided by its sum of digits (40) gives a square (110859841 = 10529²).

The spelling of 4434393640 in words is "four billion, four hundred thirty-four million, three hundred ninety-three thousand, six hundred forty".