1291882 has 4 divisors (see below), whose sum is σ = 1937826. Its totient is φ = 645940.

The previous prime is 1291877. The next prime is 1291883. The reversal of 1291882 is 2881921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2881921 = 7 ⋅411703.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 62001 = 1109^2 + 249^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1291883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322969 + ... + 322972.

2^1291882 is an apocalyptic number.

1291882 is a deficient number, since it is larger than the sum of its proper divisors (645944).

1291882 is an equidigital number, since it uses as much as digits as its factorization.

1291882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645943.

The product of its digits is 2304, while the sum is 31.

The square root of 1291882 is about 1136.6098715039. The cubic root of 1291882 is about 108.9116361535.

The spelling of 1291882 in words is "one million, two hundred ninety-one thousand, eight hundred eighty-two".