1891136 has 28 divisors (see below), whose sum is σ = 4043172. Its totient is φ = 872448.

The previous prime is 1891133. The next prime is 1891147. The reversal of 1891136 is 6311981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 891136 = 1000^2 + 944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1891099 and 1891108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891133) 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, 305 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (144399).

2^1891136 is an apocalyptic number.

1891136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1891136 is an abundant number, since it is smaller than the sum of its proper divisors (2152036).

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

1891136 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (1891135) it forms an eRAP, since the sums of their prime factors are consecutive (2297 and 2298).

1891136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2288 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 1891136 is about 1375.1858056277. The cubic root of 1891136 is about 123.6633253562.

The spelling of 1891136 in words is "one million, eight hundred ninety-one thousand, one hundred thirty-six".