1938889 has 2 divisors, whose sum is σ = 1938890. Its totient is φ = 1938888.

The previous prime is 1938887. The next prime is 1938907. The reversal of 1938889 is 9888391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1937664 + 1225 = 1392^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938889 - 2¹ = 1938887 is a prime.

Together with 1938887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1938883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969444 + 969445.

It is an arithmetic number, because the mean of its divisors is an integer number (969445).

2^1938889 is an apocalyptic number.

It is an amenable number.

1938889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938889 is an equidigital number, since it uses as much as digits as its factorization.

1938889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The square root of 1938889 is about 1392.4399448450. The cubic root of 1938889 is about 124.6955577882.

The spelling of 1938889 in words is "one million, nine hundred thirty-eight thousand, eight hundred eighty-nine".