1378791 has 12 divisors (see below), whose sum is σ = 2003040. Its totient is φ = 913920.

The previous prime is 1378777. The next prime is 1378799. The reversal of 1378791 is 1978731.

It is not a de Polignac number, because 1378791 - 2⁵ = 1378759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1831 + ... + 2471.

It is an arithmetic number, because the mean of its divisors is an integer number (166920).

2^1378791 is an apocalyptic number.

1378791 is a deficient number, since it is larger than the sum of its proper divisors (624249).

1378791 is a wasteful number, since it uses less digits than its factorization.

1378791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 883 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1378791 is about 1174.2193151196. The cubic root of 1378791 is about 111.3011060064.

The spelling of 1378791 in words is "one million, three hundred seventy-eight thousand, seven hundred ninety-one".