1391993 has 8 divisors (see below), whose sum is σ = 1456896. Its totient is φ = 1328400.

The previous prime is 1391989. The next prime is 1392007. The reversal of 1391993 is 3991931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1391993 - 2² = 1391989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2303 + ... + 2843.

It is an arithmetic number, because the mean of its divisors is an integer number (182112).

2^1391993 is an apocalyptic number.

It is an amenable number.

1391993 is a deficient number, since it is larger than the sum of its proper divisors (64903).

1391993 is an equidigital number, since it uses as much as digits as its factorization.

1391993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its digits is 6561, while the sum is 35.

The square root of 1391993 is about 1179.8275297687. The cubic root of 1391993 is about 111.6552162710.

The spelling of 1391993 in words is "one million, three hundred ninety-one thousand, nine hundred ninety-three".