2051440 has 20 divisors (see below), whose sum is σ = 4769784. Its totient is φ = 820544.

The previous prime is 2051437. The next prime is 2051443. The reversal of 2051440 is 441502.

It is an interprime number because it is at equal distance from previous prime (2051437) and next prime (2051443).

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

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12742 + ... + 12901.

2^2051440 is an apocalyptic number.

2051440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051440 is an abundant number, since it is smaller than the sum of its proper divisors (2718344).

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

2051440 is a wasteful number, since it uses less digits than its factorization.

2051440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656 (or 25650 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2051440 is about 1432.2848878627. The cubic root of 2051440 is about 127.0631467234.

Adding to 2051440 its reverse (441502), we get a palindrome (2492942).

The spelling of 2051440 in words is "two million, fifty-one thousand, four hundred forty".