1291320 has 96 divisors (see below), whose sum is σ = 4464720. Its totient is φ = 322560.

The previous prime is 1291313. The next prime is 1291321. The reversal of 1291320 is 231921.

It is a happy number.

1291320 is nontrivially palindromic in base 11 and base 14.

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

It is a junction number, because it is equal to n+sod(n) for n = 1291293 and 1291302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6015 + ... + 6225.

2^1291320 is an apocalyptic number.

1291320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232360).

1291320 is an abundant number, since it is smaller than the sum of its proper divisors (3173400).

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

1291320 is a wasteful number, since it uses less digits than its factorization.

1291320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1291320 is about 1136.3626181814. The cubic root of 1291320 is about 108.8958407951.

The spelling of 1291320 in words is "one million, two hundred ninety-one thousand, three hundred twenty".