1881761 has 4 divisors (see below), whose sum is σ = 2150592. Its totient is φ = 1612932.

The previous prime is 1881757. The next prime is 1881767. The reversal of 1881761 is 1671881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1671881 = 331 ⋅5051.

It is a cyclic number.

It is not a de Polignac number, because 1881761 - 2² = 1881757 is a prime.

It is a super-2 number, since 2×1881761² = 7082048922242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1881767) 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 3 ways as a sum of consecutive naturals, for example, 134405 + ... + 134418.

It is an arithmetic number, because the mean of its divisors is an integer number (537648).

2^1881761 is an apocalyptic number.

It is an amenable number.

1881761 is a deficient number, since it is larger than the sum of its proper divisors (268831).

1881761 is an equidigital number, since it uses as much as digits as its factorization.

1881761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268830.

The product of its digits is 2688, while the sum is 32.

The square root of 1881761 is about 1371.7729403950. The cubic root of 1881761 is about 123.4586397913.

The spelling of 1881761 in words is "one million, eight hundred eighty-one thousand, seven hundred sixty-one".