1722140 has 24 divisors (see below), whose sum is σ = 4133472. Its totient is φ = 590400.

The previous prime is 1722137. The next prime is 1722163. The reversal of 1722140 is 412271.

1722140 = 493² + 494² + ... + 499².

It is an Ulam number.

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, 6011 + ... + 6290.

It is an arithmetic number, because the mean of its divisors is an integer number (172228).

2^1722140 is an apocalyptic number.

1722140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1722140 is an abundant number, since it is smaller than the sum of its proper divisors (2411332).

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

1722140 is a wasteful number, since it uses less digits than its factorization.

1722140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12317 (or 12315 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1722140 is about 1312.3033185967. The cubic root of 1722140 is about 119.8641982255.

The spelling of 1722140 in words is "one million, seven hundred twenty-two thousand, one hundred forty".