1721049 has 8 divisors (see below), whose sum is σ = 2503392. Its totient is φ = 1043040.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721049 is 9401271.

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

It is not a de Polignac number, because 1721049 - 2¹¹ = 1719001 is a prime.

1721049 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1721009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26044 + ... + 26109.

It is an arithmetic number, because the mean of its divisors is an integer number (312924).

2^1721049 is an apocalyptic number.

It is an amenable number.

1721049 is a deficient number, since it is larger than the sum of its proper divisors (782343).

1721049 is a wasteful number, since it uses less digits than its factorization.

1721049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52167.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1721049 is about 1311.8875714024. The cubic root of 1721049 is about 119.8388809912.

It can be divided in two parts, 172 and 1049, that added together give a palindrome (1221).

The spelling of 1721049 in words is "one million, seven hundred twenty-one thousand, forty-nine".