1391844 has 12 divisors (see below), whose sum is σ = 3247664. Its totient is φ = 463944.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391844 is 4481931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1391849) 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 3 ways as a sum of consecutive naturals, for example, 57982 + ... + 58005.

2^1391844 is an apocalyptic number.

It is an amenable number.

1391844 is an abundant number, since it is smaller than the sum of its proper divisors (1855820).

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

1391844 is a wasteful number, since it uses less digits than its factorization.

1391844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115994 (or 115992 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1391844 is about 1179.7643832563. The cubic root of 1391844 is about 111.6512322422.

The spelling of 1391844 in words is "one million, three hundred ninety-one thousand, eight hundred forty-four".