1027645 has 4 divisors (see below), whose sum is σ = 1233180. Its totient is φ = 822112.

The previous prime is 1027643. The next prime is 1027679. The reversal of 1027645 is 5467201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5467201 = 1531 ⋅3571.

It can be written as a sum of positive squares in 2 ways, for example, as 755161 + 272484 = 869^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 1027645 - 2¹ = 1027643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1027643) 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, 102760 + ... + 102769.

It is an arithmetic number, because the mean of its divisors is an integer number (308295).

2^1027645 is an apocalyptic number.

It is an amenable number.

1027645 is a deficient number, since it is larger than the sum of its proper divisors (205535).

1027645 is an equidigital number, since it uses as much as digits as its factorization.

1027645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205534.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1027645 is about 1013.7282673379. The cubic root of 1027645 is about 100.9131364388.

The spelling of 1027645 in words is "one million, twenty-seven thousand, six hundred forty-five".