1720913440 has 24 divisors (see below), whose sum is σ = 4065658380. Its totient is φ = 688365312.

The previous prime is 1720913423. The next prime is 1720913471. The reversal of 1720913440 is 443190271.

It can be written as a sum of positive squares in 2 ways, for example, as 1665619344 + 55294096 = 40812^2 + 7436^2 .

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, 5377695 + ... + 5378014.

Almost surely, 2^1720913440 is an apocalyptic number.

1720913440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720913440 is an abundant number, since it is smaller than the sum of its proper divisors (2344744940).

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

1720913440 is a wasteful number, since it uses less digits than its factorization.

1720913440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755724 (or 10755716 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1720913440 is about 41483.8937420296. The cubic root of 1720913440 is about 1198.3573450225.

The spelling of 1720913440 in words is "one billion, seven hundred twenty million, nine hundred thirteen thousand, four hundred forty".