1881257 has 6 divisors (see below), whose sum is σ = 2188458. Its totient is φ = 1612464.

The previous prime is 1881241. The next prime is 1881263. The reversal of 1881257 is 7521881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1466521 + 414736 = 1211^2 + 644^2 .

It is not a de Polignac number, because 1881257 - 2⁴ = 1881241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19148 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (364743).

2^1881257 is an apocalyptic number.

It is an amenable number.

1881257 is a deficient number, since it is larger than the sum of its proper divisors (307201).

1881257 is an equidigital number, since it uses as much as digits as its factorization.

1881257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38407 (or 38400 counting only the distinct ones).

The product of its digits is 4480, while the sum is 32.

The square root of 1881257 is about 1371.5892242213. The cubic root of 1881257 is about 123.4476166574.

The spelling of 1881257 in words is "one million, eight hundred eighty-one thousand, two hundred fifty-seven".