1943881 has 4 divisors (see below), whose sum is σ = 1980612. Its totient is φ = 1907152.

The previous prime is 1943867. The next prime is 1943897. The reversal of 1943881 is 1883491.

It is a happy number.

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 1713481 + 230400 = 1309^2 + 480^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1943881 is a prime.

It is a super-2 number, since 2×1943881² = 7557346684322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1943861) 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, 18286 + ... + 18391.

It is an arithmetic number, because the mean of its divisors is an integer number (495153).

2^1943881 is an apocalyptic number.

It is an amenable number.

1943881 is a deficient number, since it is larger than the sum of its proper divisors (36731).

1943881 is an equidigital number, since it uses as much as digits as its factorization.

1943881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36730.

The product of its digits is 6912, while the sum is 34.

The square root of 1943881 is about 1394.2313294429. The cubic root of 1943881 is about 124.8024827265.

The spelling of 1943881 in words is "one million, nine hundred forty-three thousand, eight hundred eighty-one".