1391893 has 2 divisors, whose sum is σ = 1391894. Its totient is φ = 1391892.

The previous prime is 1391861. The next prime is 1391899. The reversal of 1391893 is 3981931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034289 + 357604 = 1017^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391893 - 2⁵ = 1391861 is a prime.

It is a super-2 number, since 2×1391893² = 3874732246898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391899) 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 as a sum of consecutive naturals, namely, 695946 + 695947.

It is an arithmetic number, because the mean of its divisors is an integer number (695947).

2^1391893 is an apocalyptic number.

It is an amenable number.

1391893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391893 is an equidigital number, since it uses as much as digits as its factorization.

1391893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 1391893 is about 1179.7851499320. The cubic root of 1391893 is about 111.6525424575.

The spelling of 1391893 in words is "one million, three hundred ninety-one thousand, eight hundred ninety-three".