1128990 has 16 divisors (see below), whose sum is σ = 2709648. Its totient is φ = 301056.

The previous prime is 1128979. The next prime is 1128997. The reversal of 1128990 is 998211.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 37633 = 1128990 / (1 + 1 + 2 + 8 + 9 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128997) 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, 18787 + ... + 18846.

It is an arithmetic number, because the mean of its divisors is an integer number (169353).

2^1128990 is an apocalyptic number.

1128990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1128990 is an abundant number, since it is smaller than the sum of its proper divisors (1580658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1128990 is a wasteful number, since it uses less digits than its factorization.

1128990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37643.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1128990 is about 1062.5394110338. The cubic root of 1128990 is about 104.1270021429.

The spelling of 1128990 in words is "one million, one hundred twenty-eight thousand, nine hundred ninety".