1166421 has 8 divisors (see below), whose sum is σ = 1646784. Its totient is φ = 731840.

The previous prime is 1166413. The next prime is 1166441. The reversal of 1166421 is 1246611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1166421 - 2³ = 1166413 is a prime.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166401) 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, 11385 + ... + 11486.

It is an arithmetic number, because the mean of its divisors is an integer number (205848).

2^1166421 is an apocalyptic number.

It is an amenable number.

1166421 is a deficient number, since it is larger than the sum of its proper divisors (480363).

1166421 is a wasteful number, since it uses less digits than its factorization.

1166421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22891.

The product of its digits is 288, while the sum is 21.

The square root of 1166421 is about 1080.0097221785. The cubic root of 1166421 is about 105.2652703041.

Subtracting from 1166421 its sum of digits (21), we obtain a square (1166400 = 1080²).

The spelling of 1166421 in words is "one million, one hundred sixty-six thousand, four hundred twenty-one".