1291872 has 24 divisors (see below), whose sum is σ = 3391416. Its totient is φ = 430592.

The previous prime is 1291861. The next prime is 1291877. The reversal of 1291872 is 2781921.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6633 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (141309).

2^1291872 is an apocalyptic number.

1291872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1291872 is an abundant number, since it is smaller than the sum of its proper divisors (2099544).

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

1291872 is a wasteful number, since it uses less digits than its factorization.

1291872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13470 (or 13462 counting only the distinct ones).

The product of its digits is 2016, while the sum is 30.

The square root of 1291872 is about 1136.6054724486. The cubic root of 1291872 is about 108.9113551373.

The spelling of 1291872 in words is "one million, two hundred ninety-one thousand, eight hundred seventy-two".