1389783 has 4 divisors (see below), whose sum is σ = 1853048. Its totient is φ = 926520.

The previous prime is 1389769. The next prime is 1389797. The reversal of 1389783 is 3879831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3879831 = 3 ⋅1293277.

It is an interprime number because it is at equal distance from previous prime (1389769) and next prime (1389797).

It is not a de Polignac number, because 1389783 - 2¹⁷ = 1258711 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389083) 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, 231628 + ... + 231633.

It is an arithmetic number, because the mean of its divisors is an integer number (463262).

2^1389783 is an apocalyptic number.

1389783 is a deficient number, since it is larger than the sum of its proper divisors (463265).

1389783 is an equidigital number, since it uses as much as digits as its factorization.

1389783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463264.

The product of its digits is 36288, while the sum is 39.

The square root of 1389783 is about 1178.8905801642. The cubic root of 1389783 is about 111.5960951088.

The spelling of 1389783 in words is "one million, three hundred eighty-nine thousand, seven hundred eighty-three".