1722261 has 8 divisors (see below), whose sum is σ = 2304864. Its totient is φ = 1143920.

The previous prime is 1722251. The next prime is 1722283. The reversal of 1722261 is 1622271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1722261 - 2⁹ = 1721749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 46 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (288108).

2^1722261 is an apocalyptic number.

It is an amenable number.

1722261 is a deficient number, since it is larger than the sum of its proper divisors (582603).

1722261 is a wasteful number, since it uses less digits than its factorization.

1722261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131.

The product of its digits is 336, while the sum is 21.

The square root of 1722261 is about 1312.3494199336. The cubic root of 1722261 is about 119.8670054359.

The spelling of 1722261 in words is "one million, seven hundred twenty-two thousand, two hundred sixty-one".