1391873 has 4 divisors (see below), whose sum is σ = 1590720. Its totient is φ = 1193028.

The previous prime is 1391861. The next prime is 1391893. The reversal of 1391873 is 3781931.

1391873 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3781931 = 19 ⋅199049.

It is a cyclic number.

It is not a de Polignac number, because 1391873 - 2¹⁸ = 1129729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391893) 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, 99413 + ... + 99426.

It is an arithmetic number, because the mean of its divisors is an integer number (397680).

2^1391873 is an apocalyptic number.

It is an amenable number.

1391873 is a deficient number, since it is larger than the sum of its proper divisors (198847).

1391873 is an equidigital number, since it uses as much as digits as its factorization.

1391873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198846.

The product of its digits is 4536, while the sum is 32.

The square root of 1391873 is about 1179.7766737819. The cubic root of 1391873 is about 111.6520076795.

The spelling of 1391873 in words is "one million, three hundred ninety-one thousand, eight hundred seventy-three".