1790991 has 10 divisors (see below), whose sum is σ = 2675552. Its totient is φ = 1193940.

The previous prime is 1790989. The next prime is 1791017. The reversal of 1790991 is 1990971.

It is not a de Polignac number, because 1790991 - 2¹ = 1790989 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1790951) 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 9 ways as a sum of consecutive naturals, for example, 10975 + ... + 11136.

2^1790991 is an apocalyptic number.

1790991 is a deficient number, since it is larger than the sum of its proper divisors (884561).

1790991 is an equidigital number, since it uses as much as digits as its factorization.

1790991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22123 (or 22114 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 1790991 is about 1338.2791188687. The cubic root of 1790991 is about 121.4407575841.

The spelling of 1790991 in words is "one million, seven hundred ninety thousand, nine hundred ninety-one".