1291104 has 36 divisors (see below), whose sum is σ = 3672396. Its totient is φ = 430272.

The previous prime is 1291079. The next prime is 1291111. The reversal of 1291104 is 4011921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1954 + ... + 2529.

It is an arithmetic number, because the mean of its divisors is an integer number (102011).

2^1291104 is an apocalyptic number.

It is an amenable number.

1291104 is an abundant number, since it is smaller than the sum of its proper divisors (2381292).

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

1291104 is a wasteful number, since it uses less digits than its factorization.

1291104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499 (or 4488 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1291104 is about 1136.2675741215. The cubic root of 1291104 is about 108.8897687621.

The spelling of 1291104 in words is "one million, two hundred ninety-one thousand, one hundred four".