1720140 has 24 divisors (see below), whose sum is σ = 4816560. Its totient is φ = 458688.

The previous prime is 1720133. The next prime is 1720151. The reversal of 1720140 is 410271.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14275 + ... + 14394.

It is an arithmetic number, because the mean of its divisors is an integer number (200690).

2^1720140 is an apocalyptic number.

1720140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720140 is an abundant number, since it is smaller than the sum of its proper divisors (3096420).

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

1720140 is a wasteful number, since it uses less digits than its factorization.

1720140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28681 (or 28679 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1720140 is about 1311.5410782740. The cubic root of 1720140 is about 119.8177789915.

The spelling of 1720140 in words is "one million, seven hundred twenty thousand, one hundred forty".