1120645 has 4 divisors (see below), whose sum is σ = 1344780. Its totient is φ = 896512.

The previous prime is 1120633. The next prime is 1120649. The reversal of 1120645 is 5460211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5460211 = 131 ⋅41681.

It can be written as a sum of positive squares in 2 ways, for example, as 857476 + 263169 = 926^2 + 513^2 .

It is a cyclic number.

It is not a de Polignac number, because 1120645 - 2⁷ = 1120517 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120649) 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, 112060 + ... + 112069.

It is an arithmetic number, because the mean of its divisors is an integer number (336195).

2^1120645 is an apocalyptic number.

It is an amenable number.

1120645 is a deficient number, since it is larger than the sum of its proper divisors (224135).

1120645 is an equidigital number, since it uses as much as digits as its factorization.

1120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224134.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1120645 is about 1058.6052144213. The cubic root of 1120645 is about 103.8698136798.

Adding to 1120645 its reverse (5460211), we get a palindrome (6580856).

The spelling of 1120645 in words is "one million, one hundred twenty thousand, six hundred forty-five".