1881217 has 4 divisors (see below), whose sum is σ = 2025940. Its totient is φ = 1736496.

The previous prime is 1881211. The next prime is 1881221. The reversal of 1881217 is 7121881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 1679616 = 449^2 + 1296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881217 - 2¹⁵ = 1848449 is a prime.

It is a super-3 number, since 3×1881217³ = 19972753348633335939, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881211) 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, 72342 + ... + 72367.

It is an arithmetic number, because the mean of its divisors is an integer number (506485).

2^1881217 is an apocalyptic number.

It is an amenable number.

1881217 is a deficient number, since it is larger than the sum of its proper divisors (144723).

1881217 is a wasteful number, since it uses less digits than its factorization.

1881217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144722.

The product of its digits is 896, while the sum is 28.

The square root of 1881217 is about 1371.5746425186. The cubic root of 1881217 is about 123.4467417211.

The spelling of 1881217 in words is "one million, eight hundred eighty-one thousand, two hundred seventeen".