1993391 has 4 divisors (see below), whose sum is σ = 1999392. Its totient is φ = 1987392.

The previous prime is 1993367. The next prime is 1993417. The reversal of 1993391 is 1933991.

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: 1933991 = 19 ⋅101789.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1993391 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2471 + ... + 3176.

It is an arithmetic number, because the mean of its divisors is an integer number (499848).

2^1993391 is an apocalyptic number.

1993391 is a deficient number, since it is larger than the sum of its proper divisors (6001).

1993391 is an equidigital number, since it uses as much as digits as its factorization.

1993391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

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

The square root of 1993391 is about 1411.8749944666. The cubic root of 1993391 is about 125.8531715381.

The spelling of 1993391 in words is "one million, nine hundred ninety-three thousand, three hundred ninety-one".