1128749 has 8 divisors (see below), whose sum is σ = 1214208. Its totient is φ = 1045440.

The previous prime is 1128737. The next prime is 1128761. The reversal of 1128749 is 9478211.

It is an interprime number because it is at equal distance from previous prime (1128737) and next prime (1128761).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1128749 - 2¹² = 1124653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (151776).

2^1128749 is an apocalyptic number.

It is an amenable number.

1128749 is a deficient number, since it is larger than the sum of its proper divisors (85459).

1128749 is an equidigital number, since it uses as much as digits as its factorization.

1128749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its digits is 4032, while the sum is 32.

The square root of 1128749 is about 1062.4259974229. The cubic root of 1128749 is about 104.1195924542.

The spelling of 1128749 in words is "one million, one hundred twenty-eight thousand, seven hundred forty-nine".