1140645 has 32 divisors (see below), whose sum is σ = 2064384. Its totient is φ = 532800.

The previous prime is 1140637. The next prime is 1140677. The reversal of 1140645 is 5460411.

It is not a de Polignac number, because 1140645 - 2³ = 1140637 is a prime.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

1140645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5004 + ... + 5226.

It is an arithmetic number, because the mean of its divisors is an integer number (64512).

2^1140645 is an apocalyptic number.

1140645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1140645 is a deficient number, since it is larger than the sum of its proper divisors (923739).

1140645 is a wasteful number, since it uses less digits than its factorization.

1140645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1140645 is about 1068.0098314154. The cubic root of 1140645 is about 104.4840905857.

Subtracting from 1140645 its sum of digits (21), we obtain a square (1140624 = 1068²).

The spelling of 1140645 in words is "one million, one hundred forty thousand, six hundred forty-five".