1129820 has 24 divisors (see below), whose sum is σ = 2512944. Its totient is φ = 425216.

The previous prime is 1129819. The next prime is 1129831. The reversal of 1129820 is 289211.

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 7 ways as a sum of consecutive naturals, for example, 1322 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (104706).

2^1129820 is an apocalyptic number.

1129820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1129820 is an abundant number, since it is smaller than the sum of its proper divisors (1383124).

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

1129820 is a wasteful number, since it uses less digits than its factorization.

1129820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3347 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1129820 is about 1062.9299130234. The cubic root of 1129820 is about 104.1525129214.

The spelling of 1129820 in words is "one million, one hundred twenty-nine thousand, eight hundred twenty".