1722156 has 12 divisors (see below), whose sum is σ = 4018392. Its totient is φ = 574048.

The previous prime is 1722137. The next prime is 1722163. The reversal of 1722156 is 6512271.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71745 + ... + 71768.

It is an arithmetic number, because the mean of its divisors is an integer number (334866).

2^1722156 is an apocalyptic number.

It is an amenable number.

1722156 is an abundant number, since it is smaller than the sum of its proper divisors (2296236).

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

1722156 is a wasteful number, since it uses less digits than its factorization.

1722156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143520 (or 143518 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 1722156 is about 1312.3094147342. The cubic root of 1722156 is about 119.8645694344.

The spelling of 1722156 in words is "one million, seven hundred twenty-two thousand, one hundred fifty-six".