1291478 has 4 divisors (see below), whose sum is σ = 1937220. Its totient is φ = 645738.

The previous prime is 1291471. The next prime is 1291481. The reversal of 1291478 is 8741921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8741921 = 2801 ⋅3121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322868 + ... + 322871.

It is an arithmetic number, because the mean of its divisors is an integer number (484305).

2^1291478 is an apocalyptic number.

1291478 is a deficient number, since it is larger than the sum of its proper divisors (645742).

1291478 is an equidigital number, since it uses as much as digits as its factorization.

1291478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645741.

The product of its digits is 4032, while the sum is 32.

The square root of 1291478 is about 1136.4321361172. The cubic root of 1291478 is about 108.9002819461.

The spelling of 1291478 in words is "one million, two hundred ninety-one thousand, four hundred seventy-eight".