1291072 has 14 divisors (see below), whose sum is σ = 2562098. Its totient is φ = 645504.

The previous prime is 1291063. The next prime is 1291079. The reversal of 1291072 is 2701921.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 576 = 1136^2 + 24^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (183007).

2^1291072 is an apocalyptic number.

It is an amenable number.

1291072 is a deficient number, since it is larger than the sum of its proper divisors (1271026).

1291072 is an equidigital number, since it uses as much as digits as its factorization.

1291072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20185 (or 20175 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1291072 is about 1136.2534928439. The cubic root of 1291072 is about 108.8888691440. Note that the first 4 decimals are identical.

Adding to 1291072 its reverse (2701921), we get a palindrome (3992993).

The spelling of 1291072 in words is "one million, two hundred ninety-one thousand, seventy-two".