1722740 has 12 divisors (see below), whose sum is σ = 3617796. Its totient is φ = 689088.

The previous prime is 1722739. The next prime is 1722751. The reversal of 1722740 is 472271.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 1532644 = 436^2 + 1238^2 .

It is a congruent number.

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, 43049 + ... + 43088.

It is an arithmetic number, because the mean of its divisors is an integer number (301483).

2^1722740 is an apocalyptic number.

1722740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1722740 is an abundant number, since it is smaller than the sum of its proper divisors (1895056).

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

1722740 is a wasteful number, since it uses less digits than its factorization.

1722740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86146 (or 86144 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 1722740 is about 1312.5319043741. The cubic root of 1722740 is about 119.8781169871.

The spelling of 1722740 in words is "one million, seven hundred twenty-two thousand, seven hundred forty".