2001345444 has 72 divisors (see below), whose sum is σ = 5863148928. Its totient is φ = 563754240.

The previous prime is 2001345433. The next prime is 2001345469. The reversal of 2001345444 is 4445431002.

It is a happy number.

2001345444 is a `hidden beast` number, since 200 + 1 + 3 + 454 + 4 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38037 + ... + 73820.

It is an arithmetic number, because the mean of its divisors is an integer number (81432624).

Almost surely, 2^2001345444 is an apocalyptic number.

It is an amenable number.

2001345444 is an abundant number, since it is smaller than the sum of its proper divisors (3861803484).

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

2001345444 is a wasteful number, since it uses less digits than its factorization.

2001345444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111945 (or 111940 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 2001345444 is about 44736.3995422072. The cubic root of 2001345444 is about 1260.2035121010.

Adding to 2001345444 its reverse (4445431002), we get a palindrome (6446776446).

The spelling of 2001345444 in words is "two billion, one million, three hundred forty-five thousand, four hundred forty-four".