1291828 has 12 divisors (see below), whose sum is σ = 2316132. Its totient is φ = 630080.

The previous prime is 1291819. The next prime is 1291831. The reversal of 1291828 is 8281921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 121104 + 1170724 = 348^2 + 1082^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1291828.

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 3 ways as a sum of consecutive naturals, for example, 3775 + ... + 4102.

It is an arithmetic number, because the mean of its divisors is an integer number (193011).

2^1291828 is an apocalyptic number.

It is an amenable number.

1291828 is a deficient number, since it is larger than the sum of its proper divisors (1024304).

1291828 is a wasteful number, since it uses less digits than its factorization.

1291828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922 (or 7920 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 1291828 is about 1136.5861164030. The cubic root of 1291828 is about 108.9101186490.

The spelling of 1291828 in words is "one million, two hundred ninety-one thousand, eight hundred twenty-eight".