2145504440 has 16 divisors (see below), whose sum is σ = 4827385080. Its totient is φ = 858201760.

The previous prime is 2145504437. The next prime is 2145504461. The reversal of 2145504440 is 444055412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26818766 + ... + 26818845.

Almost surely, 2^2145504440 is an apocalyptic number.

2145504440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145504440 is an abundant number, since it is smaller than the sum of its proper divisors (2681880640).

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

2145504440 is a wasteful number, since it uses less digits than its factorization.

2145504440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53637622 (or 53637618 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 2145504440 is about 46319.5902399838. The cubic root of 2145504440 is about 1289.7626789356.

Adding to 2145504440 its reverse (444055412), we get a palindrome (2589559852).

The spelling of 2145504440 in words is "two billion, one hundred forty-five million, five hundred four thousand, four hundred forty".