1066421 has 4 divisors (see below), whose sum is σ = 1080000. Its totient is φ = 1052844.

The previous prime is 1066411. The next prime is 1066423. The reversal of 1066421 is 1246601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066421 is a prime.

It is a super-2 number, since 2×1066421² = 2274507498482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1066393 and 1066402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066423) 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, 6671 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (270000).

2^1066421 is an apocalyptic number.

It is an amenable number.

1066421 is a deficient number, since it is larger than the sum of its proper divisors (13579).

1066421 is an equidigital number, since it uses as much as digits as its factorization.

1066421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13578.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1066421 is about 1032.6766192763. The cubic root of 1066421 is about 102.1667463550.

The spelling of 1066421 in words is "one million, sixty-six thousand, four hundred twenty-one".