2145717440 has 28 divisors (see below), whose sum is σ = 5109490416. Its totient is φ = 858286848.

The previous prime is 2145717433. The next prime is 2145717491. The reversal of 2145717440 is 447175412.

It is a self number, because there is not a number n which added to its sum of digits gives 2145717440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352364 + ... + 3353003.

Almost surely, 2^2145717440 is an apocalyptic number.

2145717440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145717440 is an abundant number, since it is smaller than the sum of its proper divisors (2963772976).

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

2145717440 is an equidigital number, since it uses as much as digits as its factorization.

2145717440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705384 (or 6705374 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 2145717440 is about 46321.8894260586. The cubic root of 2145717440 is about 1289.8053589311.

The spelling of 2145717440 in words is "two billion, one hundred forty-five million, seven hundred seventeen thousand, four hundred forty".