1891264 has 28 divisors (see below), whose sum is σ = 3886200. Its totient is φ = 912128.

The previous prime is 1891249. The next prime is 1891273. The reversal of 1891264 is 4621981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1347 + ... + 2365.

2^1891264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943100).

1891264 is an abundant number, since it is smaller than the sum of its proper divisors (1994936).

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

1891264 is a wasteful number, since it uses less digits than its factorization.

1891264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1050 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 1891264 is about 1375.2323440059. The cubic root of 1891264 is about 123.6661153104. Note that the first 3 decimals are identical.

The spelling of 1891264 in words is "one million, eight hundred ninety-one thousand, two hundred sixty-four".