1291128 has 32 divisors (see below), whose sum is σ = 3369600. Its totient is φ = 411488.

The previous prime is 1291117. The next prime is 1291139. The reversal of 1291128 is 8211921.

It is an interprime number because it is at equal distance from previous prime (1291117) and next prime (1291139).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1291098 and 1291107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (105300).

2^1291128 is an apocalyptic number.

It is an amenable number.

1291128 is an abundant number, since it is smaller than the sum of its proper divisors (2078472).

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

1291128 is a wasteful number, since it uses less digits than its factorization.

1291128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371 (or 2367 counting only the distinct ones).

The product of its digits is 288, while the sum is 24.

The square root of 1291128 is about 1136.2781349652. The cubic root of 1291128 is about 108.8904434659.

The spelling of 1291128 in words is "one million, two hundred ninety-one thousand, one hundred twenty-eight".