2051343440 has 20 divisors (see below), whose sum is σ = 4769373684. Its totient is φ = 820537344.

The previous prime is 2051343419. The next prime is 2051343461. The reversal of 2051343440 is 443431502.

It is an interprime number because it is at equal distance from previous prime (2051343419) and next prime (2051343461).

It can be written as a sum of positive squares in 2 ways, for example, as 874030096 + 1177313344 = 29564^2 + 34312^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12820817 + ... + 12820976.

Almost surely, 2^2051343440 is an apocalyptic number.

2051343440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051343440 is an abundant number, since it is smaller than the sum of its proper divisors (2718030244).

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

2051343440 is a wasteful number, since it uses less digits than its factorization.

2051343440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641806 (or 25641800 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 2051343440 is about 45291.7590738094. The cubic root of 2051343440 is about 1270.6115309784.

Adding to 2051343440 its reverse (443431502), we get a palindrome (2494774942).

The spelling of 2051343440 in words is "two billion, fifty-one million, three hundred forty-three thousand, four hundred forty".