1128649 has 4 divisors (see below), whose sum is σ = 1137664. Its totient is φ = 1119636.

The previous prime is 1128643. The next prime is 1128661. The reversal of 1128649 is 9468211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9468211 = 641 ⋅14771.

It is a cyclic number.

It is not a de Polignac number, because 1128649 - 2³ = 1128641 is a prime.

It is a Duffinian number.

1128649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128649.

It is not an unprimeable number, because it can be changed into a prime (1128641) 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, 4317 + ... + 4570.

It is an arithmetic number, because the mean of its divisors is an integer number (284416).

2^1128649 is an apocalyptic number.

It is an amenable number.

1128649 is a deficient number, since it is larger than the sum of its proper divisors (9015).

1128649 is an equidigital number, since it uses as much as digits as its factorization.

1128649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9014.

The product of its digits is 3456, while the sum is 31.

The square root of 1128649 is about 1062.3789342791. The cubic root of 1128649 is about 104.1165175850.

The spelling of 1128649 in words is "one million, one hundred twenty-eight thousand, six hundred forty-nine".