1066405 has 4 divisors (see below), whose sum is σ = 1279692. Its totient is φ = 853120.

The previous prime is 1066399. The next prime is 1066409. The reversal of 1066405 is 5046601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5046601 = 7 ⋅720943.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 293764 = 879^2 + 542^2 .

It is not a de Polignac number, because 1066405 - 2⁹ = 1065893 is a prime.

It is a super-2 number, since 2×1066405² = 2274439248050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066409) 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, 106636 + ... + 106645.

It is an arithmetic number, because the mean of its divisors is an integer number (319923).

2^1066405 is an apocalyptic number.

It is an amenable number.

1066405 is a deficient number, since it is larger than the sum of its proper divisors (213287).

1066405 is an equidigital number, since it uses as much as digits as its factorization.

1066405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213286.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1066405 is about 1032.6688723884. The cubic root of 1066405 is about 102.1662354011.

The spelling of 1066405 in words is "one million, sixty-six thousand, four hundred five".