1129815 has 16 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 602496.

The previous prime is 1129789. The next prime is 1129819. The reversal of 1129815 is 5189211.

It is not a de Polignac number, because 1129815 - 2⁸ = 1129559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4050 + ... + 4319.

It is an arithmetic number, because the mean of its divisors is an integer number (125550).

2^1129815 is an apocalyptic number.

1129815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1129815 is a deficient number, since it is larger than the sum of its proper divisors (878985).

1129815 is an equidigital number, since it uses as much as digits as its factorization.

1129815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8383 (or 8377 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1129815 is about 1062.9275610313. The cubic root of 1129815 is about 104.1523592794.

The spelling of 1129815 in words is "one million, one hundred twenty-nine thousand, eight hundred fifteen".