2051505240 has 384 divisors, whose sum is σ = 7110374400. Its totient is φ = 471905280.

The previous prime is 2051505199. The next prime is 2051505271. The reversal of 2051505240 is 425051502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2051505240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28894405 + ... + 28894475.

It is an arithmetic number, because the mean of its divisors is an integer number (18516600).

Almost surely, 2^2051505240 is an apocalyptic number.

2051505240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051505240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3555187200).

2051505240 is an abundant number, since it is smaller than the sum of its proper divisors (5058869160).

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

2051505240 is a wasteful number, since it uses less digits than its factorization.

2051505240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 2051505240 is about 45293.5452354969. The cubic root of 2051505240 is about 1270.6449366540.

Adding to 2051505240 its reverse (425051502), we get a palindrome (2476556742).

The spelling of 2051505240 in words is "two billion, fifty-one million, five hundred five thousand, two hundred forty".