2145104440 has 32 divisors (see below), whose sum is σ = 4929180480. Its totient is φ = 839784832.

The previous prime is 2145104431. The next prime is 2145104441. The reversal of 2145104440 is 444015412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145104441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568627 + ... + 572386.

It is an arithmetic number, because the mean of its divisors is an integer number (154036890).

Almost surely, 2^2145104440 is an apocalyptic number.

2145104440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145104440 is an abundant number, since it is smaller than the sum of its proper divisors (2784076040).

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

2145104440 is a wasteful number, since it uses less digits than its factorization.

2145104440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141071 (or 1141067 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 2145104440 is about 46315.2722112264. The cubic root of 2145104440 is about 1289.6825210752.

Adding to 2145104440 its reverse (444015412), we get a palindrome (2589119852).

The spelling of 2145104440 in words is "two billion, one hundred forty-five million, one hundred four thousand, four hundred forty".