1721242 has 8 divisors (see below), whose sum is σ = 2607732. Its totient is φ = 852000.

The previous prime is 1721227. The next prime is 1721243. The reversal of 1721242 is 2421271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1585081 + 136161 = 1259^2 + 369^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1721243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4059 + ... + 4462.

2^1721242 is an apocalyptic number.

1721242 is a deficient number, since it is larger than the sum of its proper divisors (886490).

1721242 is a wasteful number, since it uses less digits than its factorization.

1721242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8624.

The product of its digits is 224, while the sum is 19.

The square root of 1721242 is about 1311.9611274729. The cubic root of 1721242 is about 119.8433604375.

The spelling of 1721242 in words is "one million, seven hundred twenty-one thousand, two hundred forty-two".