1921166 has 16 divisors (see below), whose sum is σ = 3267600. Its totient is φ = 839808.

The previous prime is 1921159. The next prime is 1921169. The reversal of 1921166 is 6611291.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 2438.

It is an arithmetic number, because the mean of its divisors is an integer number (204225).

2^1921166 is an apocalyptic number.

1921166 is a deficient number, since it is larger than the sum of its proper divisors (1346434).

1921166 is a wasteful number, since it uses less digits than its factorization.

1921166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923.

The product of its digits is 648, while the sum is 26.

The square root of 1921166 is about 1386.0613262046. The cubic root of 1921166 is about 124.3144550988.

The spelling of 1921166 in words is "one million, nine hundred twenty-one thousand, one hundred sixty-six".