1720005140 has 48 divisors (see below), whose sum is σ = 4132162944. Its totient is φ = 589123200.

The previous prime is 1720005121. The next prime is 1720005149. The reversal of 1720005140 is 415000271.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720005149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147110 + ... + 158370.

It is an arithmetic number, because the mean of its divisors is an integer number (86086728).

Almost surely, 2^1720005140 is an apocalyptic number.

1720005140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720005140 is an abundant number, since it is smaller than the sum of its proper divisors (2412157804).

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

1720005140 is a wasteful number, since it uses less digits than its factorization.

1720005140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12368 (or 12366 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1720005140 is about 41472.9446748118. The cubic root of 1720005140 is about 1198.1464764791.

The spelling of 1720005140 in words is "one billion, seven hundred twenty million, five thousand, one hundred forty".