1026891 has 16 divisors (see below), whose sum is σ = 1545120. Its totient is φ = 673920.

The previous prime is 1026887. The next prime is 1026899. The reversal of 1026891 is 1986201.

It is not a de Polignac number, because 1026891 - 2² = 1026887 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1026899) 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 15 ways as a sum of consecutive naturals, for example, 1711 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (96570).

2^1026891 is an apocalyptic number.

1026891 is a deficient number, since it is larger than the sum of its proper divisors (518229).

1026891 is an equidigital number, since it uses as much as digits as its factorization.

1026891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1026891 is about 1013.3563045642. The cubic root of 1026891 is about 100.8884498588. Note that the first 3 decimals are identical.

The spelling of 1026891 in words is "one million, twenty-six thousand, eight hundred ninety-one".