1721052 has 18 divisors (see below), whose sum is σ = 4350528. Its totient is φ = 573672.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721052 is 2501271.

It is an interprime number because it is at equal distance from previous prime (1721023) and next prime (1721081).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23868 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (241696).

2^1721052 is an apocalyptic number.

1721052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721052 is an abundant number, since it is smaller than the sum of its proper divisors (2629476).

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

1721052 is a wasteful number, since it uses less digits than its factorization.

1721052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47817 (or 47812 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1721052 is about 1311.8887147925. Note that the first 3 decimals coincide. The cubic root of 1721052 is about 119.8389506225.

The spelling of 1721052 in words is "one million, seven hundred twenty-one thousand, fifty-two".