1891389 has 8 divisors (see below), whose sum is σ = 2546752. Its totient is φ = 1248480.

The previous prime is 1891387. The next prime is 1891391. The reversal of 1891389 is 9831981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1891387) and next prime (1891391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1891389 - 2¹ = 1891387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2752 + ... + 3369.

It is an arithmetic number, because the mean of its divisors is an integer number (318344).

2^1891389 is an apocalyptic number.

It is an amenable number.

1891389 is a deficient number, since it is larger than the sum of its proper divisors (655363).

1891389 is a wasteful number, since it uses less digits than its factorization.

1891389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227.

The product of its digits is 15552, while the sum is 39.

The square root of 1891389 is about 1375.2777901210. The cubic root of 1891389 is about 123.6688397536.

The spelling of 1891389 in words is "one million, eight hundred ninety-one thousand, three hundred eighty-nine".