1891026 has 28 divisors (see below), whose sum is σ = 4256142. Its totient is φ = 629856.

The previous prime is 1891007. The next prime is 1891027. The reversal of 1891026 is 6201981.

It can be written as a sum of positive squares in only one way, i.e., 998001 + 893025 = 999^2 + 945^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891027) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 810 + ... + 2106.

2^1891026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2128071).

1891026 is an abundant number, since it is smaller than the sum of its proper divisors (2365116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1891026 is an equidigital number, since it uses as much as digits as its factorization.

1891026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317 (or 1302 counting only the distinct ones).

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

The square root of 1891026 is about 1375.1458104507. The cubic root of 1891026 is about 123.6609276387.

The spelling of 1891026 in words is "one million, eight hundred ninety-one thousand, twenty-six".