1921266 has 32 divisors (see below), whose sum is σ = 4366080. Its totient is φ = 625968.

The previous prime is 1921253. The next prime is 1921267. The reversal of 1921266 is 6621291.

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

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1921267) 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 15 ways as a sum of consecutive naturals, for example, 2160 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (136440).

2^1921266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2183040).

1921266 is an abundant number, since it is smaller than the sum of its proper divisors (2444814).

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

1921266 is a wasteful number, since it uses less digits than its factorization.

1921266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1921266 is about 1386.0973991751. The cubic root of 1921266 is about 124.3166119886.

It can be divided in two parts, 1921 and 266, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1921266 in words is "one million, nine hundred twenty-one thousand, two hundred sixty-six".