1828991 has 4 divisors (see below), whose sum is σ = 1835184. Its totient is φ = 1822800.

The previous prime is 1828973. The next prime is 1828993. The reversal of 1828991 is 1998281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998281 = 227 ⋅8803.

It is a cyclic number.

It is not a de Polignac number, because 1828991 - 2¹⁸ = 1566847 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 (1828993) 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, 2630 + ... + 3251.

It is an arithmetic number, because the mean of its divisors is an integer number (458796).

2^1828991 is an apocalyptic number.

1828991 is a deficient number, since it is larger than the sum of its proper divisors (6193).

1828991 is an equidigital number, since it uses as much as digits as its factorization.

1828991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6192.

The product of its digits is 10368, while the sum is 38.

The square root of 1828991 is about 1352.4019372953. The cubic root of 1828991 is about 122.2936356149.

The spelling of 1828991 in words is "one million, eight hundred twenty-eight thousand, nine hundred ninety-one".