1427665 has 4 divisors (see below), whose sum is σ = 1713204. Its totient is φ = 1142128.

The previous prime is 1427663. The next prime is 1427681. The reversal of 1427665 is 5667241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1056784 + 370881 = 1028^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1427665 - 2¹ = 1427663 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1427663) 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, 142762 + ... + 142771.

It is an arithmetic number, because the mean of its divisors is an integer number (428301).

2^1427665 is an apocalyptic number.

It is an amenable number.

1427665 is a deficient number, since it is larger than the sum of its proper divisors (285539).

1427665 is an equidigital number, since it uses as much as digits as its factorization.

1427665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285538.

The product of its digits is 10080, while the sum is 31.

The square root of 1427665 is about 1194.8493628906. The cubic root of 1427665 is about 112.6009628620.

It can be divided in two parts, 14276 and 65, that added together give a palindrome (14341).

The spelling of 1427665 in words is "one million, four hundred twenty-seven thousand, six hundred sixty-five".