1722340 has 12 divisors (see below), whose sum is σ = 3616956. Its totient is φ = 688928.

The previous prime is 1722323. The next prime is 1722359. The reversal of 1722340 is 432271.

It can be written as a sum of positive squares in 2 ways, for example, as 179776 + 1542564 = 424^2 + 1242^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43039 + ... + 43078.

It is an arithmetic number, because the mean of its divisors is an integer number (301413).

2^1722340 is an apocalyptic number.

1722340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1722340 is an abundant number, since it is smaller than the sum of its proper divisors (1894616).

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

1722340 is a wasteful number, since it uses less digits than its factorization.

1722340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86126 (or 86124 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 1722340 is about 1312.3795182797. The cubic root of 1722340 is about 119.8688381718.

The spelling of 1722340 in words is "one million, seven hundred twenty-two thousand, three hundred forty".