1938881 has 6 divisors (see below), whose sum is σ = 2255490. Its totient is φ = 1661856.

The previous prime is 1938863. The next prime is 1938883. The reversal of 1938881 is 1888391.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 207025 = 1316^2 + 455^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1938881 is a prime.

It is a super-2 number, since 2×1938881² = 7518519064322, 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 (1938883) 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, 19736 + ... + 19833.

It is an arithmetic number, because the mean of its divisors is an integer number (375915).

2^1938881 is an apocalyptic number.

It is an amenable number.

1938881 is a deficient number, since it is larger than the sum of its proper divisors (316609).

1938881 is an equidigital number, since it uses as much as digits as its factorization.

1938881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39583 (or 39576 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 1938881 is about 1392.4370721867. The cubic root of 1938881 is about 124.6953862869.

The spelling of 1938881 in words is "one million, nine hundred thirty-eight thousand, eight hundred eighty-one".