1841989 has 4 divisors (see below), whose sum is σ = 1901440. Its totient is φ = 1782540.

The previous prime is 1841969. The next prime is 1842011. The reversal of 1841989 is 9891481.

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: 9891481 = 281 ⋅35201.

It is a cyclic number.

It is not a de Polignac number, because 1841989 - 2¹⁵ = 1809221 is a prime.

It is a super-2 number, since 2×1841989² = 6785846952242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1841929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29679 + ... + 29740.

It is an arithmetic number, because the mean of its divisors is an integer number (475360).

2^1841989 is an apocalyptic number.

It is an amenable number.

1841989 is a deficient number, since it is larger than the sum of its proper divisors (59451).

1841989 is an equidigital number, since it uses as much as digits as its factorization.

1841989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59450.

The product of its digits is 20736, while the sum is 40.

The square root of 1841989 is about 1357.1989537279. The cubic root of 1841989 is about 122.5826514274.

The spelling of 1841989 in words is "one million, eight hundred forty-one thousand, nine hundred eighty-nine".