2011323440 has 40 divisors (see below), whose sum is σ = 5344375200. Its totient is φ = 689596416.

The previous prime is 2011323437. The next prime is 2011323497. The reversal of 2011323440 is 443231102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1795265 + ... + 1796384.

It is an arithmetic number, because the mean of its divisors is an integer number (133609380).

Almost surely, 2^2011323440 is an apocalyptic number.

2011323440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011323440 is an abundant number, since it is smaller than the sum of its proper divisors (3333051760).

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

2011323440 is a wasteful number, since it uses less digits than its factorization.

2011323440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591669 (or 3591663 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2011323440 is about 44847.7807700671. The cubic root of 2011323440 is about 1262.2943499297.

Adding to 2011323440 its reverse (443231102), we get a palindrome (2454554542).

The spelling of 2011323440 in words is "two billion, eleven million, three hundred twenty-three thousand, four hundred forty".